Teach me neutophthalmology for neet pg 2026 vased on PYTS

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neuro ophthalmology NEET PG 2024 2025 previous year questions high yield topics

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🧠 Neuro-Ophthalmology for NEET PG 2026 - Complete PYQ-Based Guide

Based on Kanski's Clinical Ophthalmology 10th Ed, Adams & Victor's Neurology, Bradley & Daroff's Neurology, and NEET PG 2024-2025 PYQ trends.

📋 High-Yield Topics (PYQ Frequency Order)

Rank	Topic	PYQ Frequency
1	Visual field defects (pathway lesions)	⭐⭐⭐⭐⭐
2	Papilloedema vs Pseudopapilloedema	⭐⭐⭐⭐⭐
3	Pupillary reflexes & disorders	⭐⭐⭐⭐
4	Optic neuritis / MS	⭐⭐⭐⭐
5	3rd / 4th / 6th nerve palsies	⭐⭐⭐⭐
6	Horner syndrome	⭐⭐⭐⭐
7	AION vs AAION	⭐⭐⭐
8	IIH (Idiopathic Intracranial Hypertension)	⭐⭐⭐
9	Foster Kennedy syndrome	⭐⭐⭐
10	Optic atrophy classification	⭐⭐⭐

1. VISUAL FIELD DEFECTS - The Most Tested Topic

The Fundamental Rules (Box - Memorise This)

5 Golden Rules of Visual Fields (Bradley & Daroff)

Monocular field defect = lesion in the optic nerve or retina (ipsilateral)
Bitemporal hemianopia = optic chiasm lesion ONLY
Retrochiasmal lesions = homonymous field defects
Anterior retrochiasmal lesions = incongruent homonymous defects
Posterior retrochiasmal lesions = congruent homonymous defects (cortex = most congruent)

Visual Pathway - Lesion by Level

[Eye] → [Optic Nerve] → [Chiasm] → [Optic Tract] → [LGB] → [Optic Radiation] → [Occipital Cortex]

Level	Lesion	Field Defect	Cause
Optic nerve (pre-chiasm)	Unilateral	Monocular blindness / central scotoma	Optic neuritis, AION
Junction of ON + chiasm	Junctional scotoma	Ipsilateral central + contralateral superior temporal defect	Pituitary adenoma
Chiasm (central)	Decussating nasal fibres	Bitemporal hemianopia	Pituitary adenoma (MC), craniopharyngioma
Chiasm (lateral)	Uncrossed temporal fibres	Binasal hemianopia (rare)	Bilateral carotid aneurysm
Optic tract	Post-chiasmal	Contralateral homonymous hemianopia (incongruent)	Temporal lobe tumour
Temporal lobe (Meyer's loop)	Inferior optic radiation	Contralateral superior homonymous quadrantanopia ("Pie in the sky")	Temporal lobe lesion
Parietal lobe	Superior optic radiation	Contralateral inferior homonymous quadrantanopia ("Pie on the floor")	Parietal lobe lesion
Occipital cortex	Primary visual cortex	Congruent homonymous hemianopia with macular sparing	MCA/PCA infarct

PYQ TRAP: Macular sparing = occipital cortex lesion. No macular sparing = optic tract/radiation lesion.

PYQ KEY: Temporal lesion → SUPERIOR quadrant defect. Parietal lesion → INFERIOR quadrant defect.

2. OPTIC DISC / PAPILLOEDEMA - Very Heavily Tested

Papilloedema

Definition (Kanski): Swelling of the optic nerve head secondary to raised intracranial pressure (ICP). The term "disc swelling" or "disc oedema" is non-specific - papilloedema should only be used when raised ICP is the cause.

CSF Normal Pressure: 10-18 cmH₂O on lumbar puncture (lying position)

Causes of Raised ICP leading to papilloedema:

Idiopathic intracranial hypertension (IIH)
Space-occupying lesions (tumour, haematoma)
Obstruction of ventricular system (hydrocephalus)
Cerebral venous sinus thrombosis
Meningitis / SAH (impaired CSF absorption)
Severe systemic hypertension

Papilloedema Features:

Bilateral disc swelling (key feature - unilateral disc swelling = think local cause)
Disc hyperaemia, blurred margins
Absent venous pulsations (early sign)
Peripapillary flame haemorrhages
Paton's lines (concentric peripapillary retinal folds)
Visual acuity usually preserved (early) - only affected late
Enlarged blind spot on field testing

Grading (Frisén scale): Grade 0 (normal) to Grade 5 (severe)

Pseudopapilloedema

Differentials that mimic papilloedema:

Feature	Papilloedema	Pseudo-papilloedema (disc drusen)
Spontaneous venous pulsation	Absent	Present
Disc haemorrhages	Present	Absent
FA leakage	Present	Absent
Autofluorescence	-	Drusen highly visible
Ultrasound	Normal	Calcification
Visual acuity	Preserved early	Preserved

PYQ KEY: Buried optic disc drusen in children can mimic papilloedema.

3. OPTIC ATROPHY

Type	Mechanism	Appearance	Causes
Primary	Retrolaminar nerve damage, no prior swelling	Flat white disc, clear margins, reduced vessels	Compression, Leber's HON, MS (post-neuritis), ethambutol, tobacco-alcohol amblyopia
Secondary	Post-papilloedema atrophy	Dirty grey disc, blurred margins, Paton lines	Chronic raised ICP
Consecutive	Ascending atrophy from retinal disease	Atrophy + retinal pigment changes	CRVO, RP, severe chorioretinitis
Glaucomatous	Pressure-mediated cupping	Cupped disc, cup-to-disc > 0.6	Glaucoma

Band (bow-tie) atrophy: Nasal + temporal pallor. Seen in:

Optic chiasm lesions
Optic tract lesions (contralateral eye shows bow-tie)

Temporal pallor: Loss of papillomacular bundle - classically after demyelinating optic neuritis

4. OPTIC NEURITIS

Types and Features

Feature	Typical (Demyelinating)	Parainfectious	NMOSD
Age	20-40 yr	Children	Any age, often F
Laterality	Unilateral	Bilateral	Bilateral, severe
Pain	Yes (orbital, on eye movement)	No	Yes
Disc	Retrobulbar (normal disc)	Papillitis (swollen disc)	Papillitis
Recovery	Good (90% recover)	Excellent	Poor
Association	MS	Post-viral (measles, mumps, VZV)	AQP4-IgG
Treatment	IV methylprednisolone	Steroids if severe	Steroids + immunosuppression

PYQ KEY: Pain on eye movement + unilateral visual loss in young female = demyelinating optic neuritis. First presentation of MS.

Optic Neuritis Treatment Trial (ONTT): IV methylprednisolone speeds recovery but doesn't improve final visual outcome. Oral prednisone alone increased recurrence - avoid it.

On Fundus exam:

Retrobulbar neuritis = normal disc ("Patient sees nothing, doctor sees nothing")
Papillitis = swollen disc (anterior optic neuritis)
Neuroretinitis = disc swelling + macular star (Bartonella, syphilis)

5. IIH - IDIOPATHIC INTRACRANIAL HYPERTENSION (Pseudotumor Cerebri)

Typical patient: Obese young woman of childbearing age

Diagnostic Criteria (Modified Dandy criteria):

Symptoms/signs of raised ICP (headache, papilloedema)
Raised CSF pressure (> 25 cmH₂O in adults, > 28 in obese)
Normal CSF composition
Normal neuroimaging (no mass, no hydrocephalus)
No other cause identified

Symptoms:

Daily headache (worse in morning, with Valsalva)
Pulsatile tinnitus
Transient visual obscurations (seconds)
Diplopia (VI nerve palsy - false localizing sign)
Visual field loss (enlarged blind spot, peripheral constriction)

Associations:

Obesity
OCP, tetracycline, vitamin A/retinoids, steroids (withdrawal)
Hypo/hyperthyroidism
Obstructive sleep apnea

Treatment:

Weight loss (first-line)
Acetazolamide (carbonic anhydrase inhibitor - reduces CSF production)
Topiramate (second-line + promotes weight loss)
Serial LP (CSF drainage)
Optic nerve sheath fenestration (for vision-threatening disease)
LP shunt / VP shunt (severe/refractory)

6. PUPILLARY DISORDERS - High-Yield PYQs

Normal Pupil Reflexes

Reflex	Afferent	Efferent	Centre
Direct light	CN II	CN III (EW nucleus)	Pretectal nucleus
Consensual	CN II (opposite eye)	CN III	Pretectal nucleus
Near reflex	Cortical	CN III	Cortex → CN III

RAPD (Relative Afferent Pupillary Defect) - Marcus Gunn Pupil

Test: Swinging flashlight test

Light in normal eye → BOTH pupils constrict
Light swung to diseased eye → BOTH pupils dilate (paradoxical dilation)
"Diseased eye sees less light" → weaker afferent signal

Causes: Optic nerve disease (most common), severe unilateral retinal disease

PYQ KEY: RAPD = afferent lesion (optic nerve). Pupils are equal in size in pure afferent lesions.

Key rule (Kanski): Anisocoria = efferent pathway problem. Equal pupils despite visual loss = afferent problem.

Adie's (Tonic) Pupil

Unilateral large pupil (mydriasis)
Lost/reduced light reaction
Slow (tonic) near response
Supersensitive to 0.1% pilocarpine (normally no reaction at this dose) - cholinergic denervation hypersensitivity
Cause: Ciliary ganglion damage (viral)
Associations: Absent knee/ankle jerks (Holmes-Adie syndrome)

Argyll Robertson Pupil

Feature	Adie Pupil	Argyll Robertson
Size	Large (mydriasis)	Small (miosis)
Light reaction	Absent/reduced	Absent
Near reaction	Slow (tonic)	Preserved
Cause	Ciliary ganglion	Syphilis, DM
Laterality	Usually unilateral	Bilateral

AR Pupil Mnemonic: "Accommodation Reflex Preserved, Light Reflex Absent" = ARLA or "Prostitute's pupil" - accommodates but doesn't react to light

Horner Syndrome

Anatomy - 3-neuron arc (Kanski):

1st neuron (central): Posterior hypothalamus → descends uncrossed through brainstem → terminates at ciliospinal centre of Budge (C8-T2)
2nd neuron (preganglionic): Ciliospinal centre → superior cervical ganglion (closely related to apical pleura - Pancoast tumour)
3rd neuron (postganglionic): Along internal carotid artery → cavernous sinus → nasociliary nerve → dilator pupillae

Classic Triad:

Ptosis (1-2 mm, Müller muscle weakness)
Miosis (unopposed sphincter, worse in dim light)
Anhidrosis (ipsilateral face - only with preganglionic lesion)
Plus: Enophthalmos (apparent), lower lid elevation (reverse ptosis), iris heterochromia (congenital)

Anisocoria accentuated in dim light (Horner) vs anisocoria worse in bright light (CN III palsy)

Pharmacological localization:

Drug	Preganglionic	Postganglionic
Cocaine 4-10%	No dilation	No dilation
Hydroxyamphetamine 1%	Dilation	No dilation
Apraclonidine 0.5%	Reversal of anisocoria	Reversal of anisocoria

Causes by level:

Level	Causes
Central	Lateral medullary syndrome (Wallenberg), MS, hypothalamic tumour
Preganglionic	Pancoast tumour (bronchogenic apical lung), cervical rib, thyroid surgery, aortic aneurysm
Postganglionic	Carotid artery dissection (painful Horner!), cavernous sinus thrombosis, cluster headache

PYQ KEY: Painful Horner of acute onset = carotid artery dissection until proven otherwise.

7. OCULAR MOTOR NERVE PALSIES

Third Nerve (CN III) Palsy

Complete 3rd nerve palsy (Harrison's):

Ptosis (complete - LPS involvement)
Eye down and out (lateral rectus + superior oblique unopposed)
Fixed dilated pupil (mydriasis) - if compressive
Loss of adduction, elevation, depression

Feature	Surgical (compressive)	Medical (microvascular)
Pupil	Fixed dilated (mydriasis)	Spared (normal)
Pain	+/-	+/- (less common)
Cause	Posterior communicating artery aneurysm	DM, HTN, Atherosclerosis
Emergency?	YES - neurosurgical emergency	No

PYQ KEY: 3rd nerve palsy with dilated pupil = ANEURYSM (PCom artery) - emergency! PYQ KEY: 3rd nerve palsy with spared pupil = microvascular (DM/HTN) - NOT an emergency.

Why pupil sparing in microvascular?: The pupillomotor fibres run on the outer surface of CN III - supplied by vasa nervorum (small vessels, spared in microvascular). Central fibres (motor to eye muscles) supplied by interior vessels, affected in ischaemia.

Fourth Nerve (CN IV) Palsy

Weakens superior oblique (depressor + intortor)
Hypertrophy of affected eye (can't depress when adducted)
Head tilt away from the affected side (to compensate)
Vertical diplopia worse on looking down
Parks-Bielschowsky 3-step test to localize

Most common cause: Trauma (CN IV has longest intracranial course), also congenital

Sixth Nerve (CN VI) Palsy

Lateral rectus palsy → convergent squint (esotropia) + horizontal diplopia (worse in gaze toward affected side)
False localizing sign in raised ICP - because of long intracranial course
Causes: Raised ICP, MS, DM, pontine glioma, Gradenigo syndrome (petrous apex)

Gradenigo syndrome: CN VI palsy + facial pain + middle ear disease (petrous apex lesion)

8. FOSTER KENNEDY SYNDROME

Classic: Frontal lobe space-occupying lesion (usually olfactory groove meningioma)

Ipsilateral optic atrophy (direct pressure on ipsilateral optic nerve)
Contralateral papilloedema (raised ICP)
Ipsilateral anosmia (frontal/olfactory involvement)

Pseudo-Foster Kennedy syndrome: AION in one eye + previous AION atrophy in other eye (no raised ICP)

PYQ KEY: True Foster Kennedy = frontal SOL. False (Pseudo) = sequential bilateral AION.

9. ANTERIOR ISCHAEMIC OPTIC NEUROPATHY (AION)

Feature	Non-Arteritic (NAION)	Arteritic (AAION = GCA)
Age	50-70 yr	> 70 yr
Cause	Atherosclerosis, DM, HTN	Giant cell arteritis
Onset	Painless, on waking	May have scalp tenderness, jaw claudication, headache
ESR/CRP	Normal	Elevated (ESR > 50, CRP raised)
Visual loss	Altitudinal field defect	Severe, may be complete
Disc	Pale oedema + flame haemorrhages	Same, may show chalky white swelling
Treatment	Risk factor modification	Urgent IV steroids (don't wait for biopsy)
Biopsy	Not needed	Temporal artery biopsy (skip lesions, take long segment)
Fellow eye risk	~15% in 5 years	Very high if untreated

PYQ KEY: "Small disc with small cup" = risk factor for NAION ("disc at risk") PYQ KEY: Altitudinal visual field defect = AION (not hemianopia, not scotoma) GCA: ESR > 50 + jaw claudication + temporal headache + sudden visual loss → immediate IV methylprednisolone before biopsy results

10. LEBER HEREDITARY OPTIC NEUROPATHY (LHON)

Maternal (mitochondrial) inheritance
Young males affected (20-30 yr)
Bilateral painless severe visual loss (sequential, weeks apart)
Central/cecocentral scotoma
Peripapillary telangiectasia (early)
Primary optic atrophy (late)
Associated with cardiac conduction defects (Wolff-Parkinson-White pattern)
Gene mutations: ND4 (11778) - most common; ND1 (3460); ND6 (14484)
Treatment: Idebenone (some benefit)

11. HIGH-YIELD PYQ QUESTIONS - SOLVED

Q1. A young woman complains of pain on eye movement and unilateral visual loss with RAPD. Disc is normal on fundoscopy. Diagnosis? → Retrobulbar optic neuritis (demyelinating - MS)

Q2. Patient with bitemporal hemianopia on visual field testing. MRI shows sella enlargement. Diagnosis? → Pituitary adenoma compressing the optic chiasm

Q3. Superior quadrantanopia in contralateral eye following temporal lobe surgery. Cause? → Damage to Meyer's loop (inferior fibers of optic radiation) → "Pie in the sky"

Q4. Obese 28-year-old woman with headache, bilateral papilloedema, normal MRI brain, CSF pressure 32 cmH₂O. Diagnosis and first-line treatment? → IIH. Treatment: Weight loss + Acetazolamide

Q5. Elderly patient with sudden visual loss, jaw claudication, scalp tenderness, ESR 80. Disc is pale and swollen. Next step? → Immediate IV methylprednisolone (GCA / Arteritic AION - don't wait for biopsy)

Q6. Third nerve palsy with dilated pupil + severe headache. Most urgent concern? → Posterior communicating artery aneurysm - neurosurgical emergency (CT angiography)

Q7. Unilateral ptosis + miosis (anisocoria worse in dark) + ipsilateral facial anhidrosis. Patient is a smoker. Diagnosis? → Horner syndrome (preganglionic) - screen for Pancoast tumour (CXR/CT chest)

Q8. Argyll Robertson pupil features? → Bilateral small irregular pupils, absent light reflex, preserved near reflex. Cause: Syphilis

Q9. Patient can't look up or down in one eye, has ptosis, but pupil is normal. Cause? → Microvascular CN III palsy (DM/HTN) - pupil-sparing

Q10. Frontal lobe meningioma patient. Right eye - disc is pale. Left eye - disc is swollen. This is? → Foster Kennedy syndrome (ipsilateral optic atrophy + contralateral papilloedema)

Q11. Young man with cecocentral scotoma, peripapillary telangiectasia, maternal relatives also affected. Diagnosis? → Leber Hereditary Optic Neuropathy (LHON)

Q12. Congruent homonymous hemianopia with macular sparing. Lesion is at? → Occipital cortex (calcarine cortex). Most congruent = most posterior.

12. RAPID REVISION TABLE - ONE-LINERS

Condition	Key One-liner
RAPD	Swinging flashlight → both pupils dilate when light hits affected eye
Adie pupil	Large pupil, tonic near reflex, supersensitive to 0.1% pilocarpine
Argyll Robertson	Small bilateral, absent light reflex, intact near reflex = syphilis
Horner	Ptosis + miosis + anhidrosis; worse in dark; sympathetic palsy
CN III surgical	Dilated fixed pupil = aneurysm (PCom)
CN III medical	Pupil-sparing = microvascular (DM)
CN IV	Longest course, most common trauma; head tilt AWAY from palsy
CN VI	False localizing sign in raised ICP; Gradenigo = petrous apex
Papilloedema	Bilateral disc swelling = raised ICP; VA preserved early
IIH	Obese young woman + bilateral papilloedema + normal MRI
NAION	Altitudinal field defect + "disc at risk" + morning waking
GCA/AAION	> 70yr, ESR high, jaw claudication → immediate IV steroids
Foster Kennedy	Frontal SOL → ipsilateral atrophy + contralateral papilloedema
Optic neuritis	Pain on eye movement + RAPD + normal disc (retrobulbar)
Bitemporal hemianopia	Chiasmal lesion (pituitary adenoma MC)
Pie in sky	Temporal lobe (Meyer's loop) = superior quadrantanopia
Macular sparing	Occipital cortex infarct (PCA territory)
LHON	Maternal inheritance, young males, cecocentral scotoma

📝 LAST-MINUTE MNEMONICS

Horner features: "PAM" - Ptosis (partial), Anhidrosis, Miosis

Visual field rules: "Before the chiasm = ipsilateral; at the chiasm = bitemporal; after the chiasm = contralateral homonymous"

Argyll Robertson: "AR = Accommodation Retained, Light Refused"

CN III palsy: "Down and Out + Ptosis + Big Pupil = Aneurysm Emergency!"

IIH drugs causing it: "TOVA" - Tetracycline, OCP/obesity, Vitamin A (retinoids), Adrenal insufficiency/steroid withdrawal

Sources: Kanski's Clinical Ophthalmology 10th Ed, pp. 758-840 | Bradley & Daroff's Neurology | Adams & Victor's Neurology 12th Ed | Harrison's 22nd Ed | NEET PG 2024-25 PYQ trends

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// ── CONTENT ───────────────────────────────────────────────────────────────────

addCoverSlide();

// ═══════════════════════════════════════════════════════════════════════
// SECTION 1 – VISUAL FIELD DEFECTS
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 1", "Visual Field Defects & Pathway Lesions", "1A237E", "0D1B2A");

addQ(1,"Visual Fields",
  "A patient has complete blindness in the LEFT eye with normal vision in the right eye. Where is the lesion?",
  "Pre-chiasmal = monocular loss");
addA(1,"Visual Fields",
  "Lesion: LEFT optic nerve (or retina)\n\nPre-chiasmal lesions cause monocular visual loss.\n• Optic nerve lesions are anterior to the chiasm\n• Examples: optic neuritis, AION, optic nerve compression\n• RAPD will be present in the affected eye",
  "Monocular blindness = ipsilateral optic nerve or retina");

addQ(2,"Visual Fields",
  "What visual field defect is produced by a lesion at the centre of the optic chiasm?",
  "Chiasm = ONLY cause of bitemporal defect");
addA(2,"Visual Fields",
  "Bitemporal Hemianopia\n\n• The chiasm carries NASAL fibres from BOTH eyes (they cross)\n• Central chiasm lesion knocks out both sets of nasal fibres\n• = loss of BOTH temporal fields\n• MC cause: Pituitary adenoma compressing chiasm from below",
  "Bitemporal hemianopia = chiasmal lesion = pituitary adenoma (MC)");

addQ(3,"Visual Fields",
  "Temporal lobe lesion. What visual field defect results, and what is the classic description?",
  "'Pie in the sky' vs 'Pie on the floor' – know both");
addA(3,"Visual Fields",
  "Contralateral SUPERIOR Homonymous Quadrantanopia\n('Pie in the sky')\n\n• Temporal lobe carries Meyer's loop = inferior optic radiation fibres\n• These fibres subserve the SUPERIOR visual field\n• Temporal lobe lesion → SUPERIOR field loss\n\nContrast: Parietal lobe lesion → inferior fibres → INFERIOR quadrantanopia ('Pie on the floor')",
  "Temporal → Superior ('sky'). Parietal → Inferior ('floor')");

addQ(4,"Visual Fields",
  "Occipital cortex infarction (PCA territory). What is the characteristic visual field defect?",
  "Macular sparing is the key differentiator from optic tract lesions");
addA(4,"Visual Fields",
  "Congruent Homonymous Hemianopia WITH MACULAR SPARING\n\n• Most congruent = most posterior (cortex)\n• Macular cortex has dual blood supply (MCA + PCA) → spared\n• Optic tract/radiation lesions = NO macular sparing\n• Occipital lesion = macula spared\n\nCongruence: anterior lesions = incongruent; posterior = congruent",
  "Macular sparing = occipital (PCA) cortex infarct");

addQ(5,"Visual Fields",
  "What field defect is seen in a parietal lobe lesion involving the optic radiation?",
  "");
addA(5,"Visual Fields",
  "Contralateral INFERIOR Homonymous Quadrantanopia\n('Pie on the floor')\n\n• Superior optic radiation fibres run through parietal lobe\n• They subserve INFERIOR visual field\n• Parietal lobe lesion → loss of inferior contralateral field\n• Also: optokinetic nystagmus (OKN) abnormality toward lesion side",
  "Parietal → Inferior homonymous quadrantanopia");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 2 – PAPILLOEDEMA & IIH
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 2", "Papilloedema, IIH & Optic Disc Disorders", "004D40", "0D1B2A");

addQ(6,"Papilloedema",
  "Define papilloedema. What is the earliest sign on fundoscopy?",
  "Do not use 'papilloedema' for unilateral disc swelling");
addA(6,"Papilloedema",
  "Papilloedema = Optic disc swelling SPECIFICALLY due to RAISED INTRACRANIAL PRESSURE\n\nEarliest signs:\n1. Loss of spontaneous venous pulsations\n2. Disc hyperaemia\n3. Blurring of disc margins (nasal margin first)\n4. Peripapillary flame haemorrhages\n5. Paton lines (concentric folds)\n\nVision: Usually PRESERVED early; enlarged blind spot on fields",
  "First sign = absent venous pulsations. VA preserved early.");

addQ(7,"Papilloedema",
  "How do you differentiate papilloedema from pseudopapilloedema (disc drusen)?",
  "Disc drusen in children commonly mimics papilloedema");
addA(7,"Papilloedema",
  "Feature              | Papilloedema  | Disc Drusen\n──────────────────── | ─────────────| ──────────────\nVenous pulsations    | Absent        | Present\nDisc haemorrhages    | Present       | Absent\nFA leakage           | Present       | Absent\nAutofluorescence     | Normal        | Drusen bright\nUltrasound           | Normal        | Calcification\nVisual acuity        | Preserved     | Preserved",
  "Autofluorescence + ultrasound calcification = disc drusen (pseudopapilloedema)");

addQ(8,"IIH",
  "Typical patient with IIH: What are the 5 Modified Dandy Criteria for diagnosis?",
  "Normal MRI is mandatory – must exclude SOL first");
addA(8,"IIH",
  "IIH (Idiopathic Intracranial Hypertension) – Modified Dandy Criteria:\n\n1. Signs/symptoms of raised ICP (headache, papilloedema)\n2. Raised CSF opening pressure (>25 cmH₂O adults; >28 obese)\n3. Normal CSF composition (no cells, normal glucose/protein)\n4. Normal neuroimaging (no mass, no hydrocephalus)\n5. No other identifiable cause",
  "Obese young woman + bilateral papilloedema + normal MRI + raised CSF = IIH");

addQ(9,"IIH",
  "What drugs cause IIH? Name the first-line treatment.",
  "Steroid WITHDRAWAL can cause IIH – not just steroid use");
addA(9,"IIH",
  "Drugs causing IIH – Mnemonic 'TOVA':\n• Tetracyclines (minocycline, doxycycline)\n• OCP / Obesity\n• Vitamin A / Retinoids (isotretinoin)\n• Adrenal insufficiency / Steroid withdrawal\n\nAlso: lithium, nalidixic acid, growth hormone\n\nFirst-line treatment:\n1. WEIGHT LOSS (most important)\n2. Acetazolamide (carbonic anhydrase inhibitor)\n3. Topiramate (also causes weight loss)\n4. Serial LP, optic nerve sheath fenestration if vision threatened",
  "1st line = Weight loss + Acetazolamide. 'TOVA' for drug causes.");

addQ(10,"Papilloedema",
  "What is Foster Kennedy Syndrome vs Pseudo-Foster Kennedy Syndrome?",
  "One has raised ICP; the other does NOT");
addA(10,"Papilloedema",
  "Foster Kennedy Syndrome (TRUE):\n• Frontal lobe SOL (olfactory groove meningioma MC)\n• Ipsilateral: optic ATROPHY (direct nerve compression)\n• Contralateral: PAPILLOEDEMA (raised ICP)\n• + Ipsilateral anosmia (frontal lobe)\n\nPseudo-Foster Kennedy:\n• Sequential bilateral AION\n• Active AION in one eye (disc swollen)\n• Old AION = atrophy in other eye\n• NO raised ICP involved",
  "True Foster Kennedy = frontal SOL + raised ICP. Pseudo = bilateral sequential AION");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 3 – PUPIL DISORDERS
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 3", "Pupillary Disorders & Reflexes", "BF360C", "0D1B2A");

addQ(11,"Pupil",
  "What is the Swinging Flashlight Test? What does a positive RAPD mean?",
  "RAPD = afferent defect. Pupils are EQUAL in pure afferent lesions.");
addA(11,"Pupil",
  "RAPD (Relative Afferent Pupillary Defect) = Marcus Gunn Pupil\n\nTest: Swing light between eyes every 2-3 seconds\n• Light in normal eye → BOTH pupils constrict\n• Light swung to diseased eye → BOTH pupils DILATE (paradoxical)\n\nPositive RAPD = afferent pathway lesion (optic nerve or severe retinal disease)\n\nKey rules:\n• RAPD = optic nerve disease (hallmark)\n• Pupils are EQUAL SIZE in afferent lesions\n• ANISOCORIA = efferent pathway abnormality",
  "RAPD positive = optic nerve lesion. Equal pupils = afferent defect.");

addQ(12,"Pupil",
  "Adie (Tonic) Pupil: Features + pharmacological test?",
  "Supersensitive to 0.1% pilocarpine = cholinergic denervation hypersensitivity");
addA(12,"Pupil",
  "Adie's (Tonic) Pupil:\n• Unilateral large pupil (mydriasis)\n• ABSENT or very poor light reaction\n• SLOW TONIC near response (pupil constricts slowly, re-dilates slowly)\n• Light-near dissociation present\n\nPharmacological test:\n• 0.1% pilocarpine → Adie pupil CONSTRICTS (hypersensitive)\n• Normal pupil: NO response to 0.1% pilocarpine\n\nHolmes-Adie Syndrome: Adie pupil + absent knee/ankle jerks\nCause: Ciliary ganglion damage (viral/idiopathic)",
  "0.1% pilocarpine constricts Adie pupil = denervation hypersensitivity");

addQ(13,"Pupil",
  "Argyll Robertson Pupil: What are the features and what is the cause?",
  "Accommodation Retained, Light Refused = syphilis");
addA(13,"Pupil",
  "Argyll Robertson Pupil:\n• Bilateral SMALL, irregular pupils (miosis)\n• ABSENT light reflex\n• PRESERVED near reflex (accommodation-convergence)\n= Light-near DISSOCIATION\n\nMnemonic: 'AR = Accommodation Retained, Light Refused'\n\nCause: Neurosyphilis (also DM – incomplete form)\nSite of lesion: Pretectal nucleus (dorsal midbrain)\n\nDifference from Adie:\nAdie = large pupil, near reaction tonic/slow\nAR = small pupil, near reaction brisk",
  "AR pupil = Syphilis. Small + absent light + intact near = pretectal lesion");

addQ(14,"Pupil",
  "Compare Adie pupil vs Argyll Robertson pupil in a table.",
  "Common PYQ – both have light-near dissociation but are OPPOSITE in size");
addA(14,"Pupil",
  "Feature            | Adie Pupil           | Argyll Robertson\n────────────────── | ─────────────────── | ───────────────────\nSize               | LARGE (mydriasis)    | SMALL (miosis)\nLight reaction     | Absent/reduced       | Absent\nNear reaction      | Slow/tonic           | Brisk/intact\nLaterality         | Usually unilateral   | Bilateral\nCause              | Ciliary ganglion     | Neurosyphilis / DM\nTest               | 0.1% pilocarpine+    | –\nAssociation        | Holmes-Adie (arefl.) | Tabes dorsalis",
  "Both have light-near dissociation. Adie = large. AR = small.");

addQ(15,"Pupil",
  "What is Horner syndrome? Name the classic triad and the 3-neuron pathway.",
  "Anisocoria WORSE in dim light = Horner syndrome");
addA(15,"Pupil",
  "Horner Syndrome (Oculosympathetic Palsy):\n\nTriad: PTOSIS (partial 1-2mm) + MIOSIS + ANHIDROSIS\nAlso: enophthalmos (apparent), lower lid elevation\nAnisocoria worse in DIM LIGHT (Horner pupil won't dilate)\n\n3-Neuron Pathway:\n1st (Central): Hypothalamus → brainstem → Ciliospinal centre of Budge (C8-T2)\n2nd (Preganglionic): To superior cervical ganglion (near apex of lung)\n3rd (Postganglionic): Along internal carotid → cavernous sinus → dilator pupillae",
  "Horner = sympathetic palsy. Ptosis + Miosis + Anhidrosis. Worse in dark.");

addQ(16,"Pupil",
  "Which drug differentiates PREGANGLIONIC from POSTGANGLIONIC Horner syndrome?",
  "Cocaine confirms Horner; hydroxyamphetamine localises it");
addA(16,"Pupil",
  "Hydroxyamphetamine 1%:\n• Releases noradrenaline from postganglionic terminals\n• Preganglionic Horner: intact neuron → DILATES (positive)\n• Postganglionic Horner: damaged neuron → NO dilation\n\nCocaine 4-10%:\n• Blocks noradrenaline reuptake\n• Normal pupil: dilates; Horner (any level): NO dilation\n• Used to CONFIRM Horner syndrome\n\nApraclonidine 0.5%: Reverses anisocoria in both pre & postganglionic Horner",
  "Hydroxyamphetamine: positive (dilates) = preganglionic. No dilation = postganglionic.");

addQ(17,"Pupil",
  "Acute painful Horner syndrome – what must be urgently excluded?",
  "Don't miss this life-threatening cause");
addA(17,"Pupil",
  "Carotid Artery Dissection\n\n• Internal carotid artery (ICA) dissection\n• Postganglionic fibres run along ICA → damaged\n• Presents: acute painful Horner + ipsilateral face/neck pain\n• May cause stroke\n\nInvestigation: CT angiography / MR angiography\n\nOther causes by level:\n• Preganglionic: Pancoast tumour (apex lung), aortic aneurysm, cervical rib\n• Central: Lateral medullary syndrome (Wallenberg), MS, hypothalamic tumour",
  "Acute painful Horner = Carotid dissection until proven otherwise. Urgent CTA.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 4 – OPTIC NEURITIS & OPTIC ATROPHY
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 4", "Optic Neuritis, Optic Atrophy & LHON", "1A237E", "0D1B2A");

addQ(18,"Optic Neuritis",
  "Classic presentation of demyelinating optic neuritis. What is the relationship to MS?",
  "Pain on eye movement is the clue");
addA(18,"Optic Neuritis",
  "Demyelinating Optic Neuritis:\n• Age: 20-40 yr, female predominance\n• Unilateral, PAINFUL (pain on eye movement – periorbital)\n• Subacute visual loss over hours-days\n• RAPD positive\n• Disc normal (RETROBULBAR – 'patient sees nothing, doctor sees nothing')\n• Colour vision lost early (especially red desaturation)\n• Uhthoff phenomenon (vision worsens with heat/exercise)\n\nMS link: 50% of ON patients develop MS within 15 years\nRecovery: >90% recover to 6/12 or better\n\nTreatment: IV methylprednisolone (speeds recovery, doesn't improve final VA)",
  "Optic neuritis = pain on eye movement + RAPD + normal disc + young female = MS");

addQ(19,"Optic Neuritis",
  "What is the difference between retrobulbar neuritis and papillitis on fundoscopy?",
  "The classic teaching: patient sees nothing / doctor sees nothing");
addA(19,"Optic Neuritis",
  "Retrobulbar Neuritis:\n• Inflammation BEHIND the globe (posterior optic nerve)\n• Fundoscopy: NORMAL disc\n• 'Patient sees nothing; doctor sees nothing'\n• Typical of demyelinating (MS-related) optic neuritis\n\nPapillitis:\n• Inflammation of the optic nerve HEAD (anterior)\n• Fundoscopy: SWOLLEN disc (disc oedema)\n• Seen in parainfectious optic neuritis (children, post-viral)\n• Also NMOSD (NMO spectrum disorder)\n\nNeuroretinitis:\n• Disc swelling + MACULAR STAR (fan-shaped exudates)\n• Cause: Bartonella henselae (cat scratch disease), syphilis",
  "Neuroretinitis = macular star = Bartonella (cat scratch disease)");

addQ(20,"Optic Neuritis",
  "What are the ONTT findings regarding oral vs IV steroids in optic neuritis?",
  "Oral steroids ALONE increased recurrence – avoid as monotherapy");
addA(20,"Optic Neuritis",
  "Optic Neuritis Treatment Trial (ONTT):\n\n1. IV methylprednisolone (1g/day × 3 days then oral taper):\n   → Speeds visual recovery by 4 weeks\n   → No improvement in FINAL visual outcome\n   → Delays MS onset\n\n2. Oral prednisolone alone (1 mg/kg/day):\n   → INCREASED rate of new attacks\n   → AVOID oral steroids alone for optic neuritis\n\n3. Placebo:\n   → Similar final outcome to IV steroids",
  "ONTT: IV steroids speed recovery but don't improve final VA. Oral alone = AVOID.");

addQ(21,"Optic Atrophy",
  "Classify optic atrophy into 4 types with appearances and causes.",
  "Primary vs secondary = margins (sharp vs blurred)");
addA(21,"Optic Atrophy",
  "Type         | Appearance                   | Causes\n──────────── | ──────────────────────────── | ──────────────────────────\nPrimary      | Flat WHITE disc, clear margins| MS post-neuritis, Leber's, compression, ethambutol, nutritional\nSecondary    | Dirty grey disc, blurred margins| Chronic papilloedema (raised ICP)\nConsecutive  | Atrophy + retinal changes     | CRVO, retinitis pigmentosa, chorioretinitis\nGlaucomatous | Cupped disc (C:D > 0.6)       | Glaucoma\n\nBand/Bow-tie atrophy: Nasal+temporal pallor → chiasm or optic tract lesion\nTemporal pallor only: Papillomacular bundle loss → post-demyelinating ON",
  "Band (bow-tie) atrophy = chiasm/tract lesion. Temporal pallor = post-demyelinating ON");

addQ(22,"Optic Atrophy",
  "Leber Hereditary Optic Neuropathy (LHON) – key features?",
  "Maternal inheritance = mitochondrial DNA mutation");
addA(22,"Optic Atrophy",
  "LHON:\n• Inheritance: MATERNAL (mitochondrial DNA)\n• Affects: Young MALES predominantly (20-30 yr)\n• Bilateral PAINLESS severe visual loss (sequential, weeks apart)\n• Visual field: Central / CECOCENTRAL scotoma\n• Early fundus: Peripapillary TELANGIECTASIA + pseudoedema\n• Late: Primary optic atrophy\n\nGene mutations (most to least common):\n• ND4 (11778) – most common ~50%\n• ND1 (3460)\n• ND6 (14484)\n\nAssociation: Cardiac conduction defects (WPW pattern)\nTreatment: Idebenone (mitochondrial antioxidant – some benefit)",
  "LHON: maternal inheritance, young males, cecocentral scotoma, ND4 mutation (MC)");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 5 – CRANIAL NERVE PALSIES
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 5", "III, IV & VI Nerve Palsies", "4A148C", "0D1B2A");

addQ(23,"CN Palsy",
  "Complete 3rd nerve palsy – what are the clinical findings?",
  "Eye position: DOWN and OUT (lateral rectus + superior oblique unopposed)");
addA(23,"CN Palsy",
  "Complete CN III (Oculomotor) Palsy:\n\n• Complete PTOSIS (levator palpebrae superioris)\n• Eye: DOWN and OUT position\n  (lateral rectus CN VI unopposed; superior oblique CN IV unopposed)\n• Loss of elevation, depression, adduction\n• Dilated FIXED pupil (if compressive)\n\nMnemonic: '3 P's' – Ptosis, Palsy of muscles, Pupil dilated (if surgical)",
  "Complete CN III = ptosis + down&out eye + ± dilated pupil");

addQ(24,"CN Palsy",
  "Surgical vs Medical CN III palsy – KEY difference and clinical significance?",
  "This is a potential neurosurgical EMERGENCY");
addA(24,"CN Palsy",
  "Feature            | Surgical (Compressive) | Medical (Microvascular)\n────────────────── | ───────────────────── | ──────────────────────\nPupil              | FIXED, DILATED         | SPARED (normal)\nCause              | PCom aneurysm          | DM, HTN, atherosclerosis\nEmergency?         | YES                    | No\nAction             | Urgent CT/CTA          | Observe, treat DM/HTN\nPain               | Often severe           | Mild/absent\n\nWHY pupil spared in medical:\nPupillomotor fibres = on outer surface (supplied by vasa nervorum → spared in ischaemia)\nMotor fibres = central (affected in ischaemia, spared in compression)",
  "Dilated pupil in CN III = ANEURYSM (PCom) – neurosurgical emergency!");

addQ(25,"CN Palsy",
  "CN IV (Trochlear) palsy – what muscle is weak, and what compensatory posture does the patient adopt?",
  "Longest intracranial course → most traumatized CN");
addA(25,"CN Palsy",
  "CN IV (Trochlear) Palsy:\n\n• Weakens: SUPERIOR OBLIQUE (depressor + intortor when eye adducted)\n• Effect: Hypertropia (affected eye HIGHER than normal eye)\n• Diplopia: Vertical, worse on LOOKING DOWN (stairs problem)\n\nCompensatory head posture:\n• Head tilts AWAY from affected side (contralateral tilt)\n• Chin depressed, face turned away from palsy\n\nDiagnosis: Parks-Bielschowsky 3-step test\n\nMC cause: TRAUMA (CN IV has longest intracranial course – very vulnerable)\nAlso: Congenital (most common cause of vertical diplopia overall)",
  "CN IV: head tilt AWAY from palsy, vertical diplopia worse on downgaze. MC cause = trauma.");

addQ(26,"CN Palsy",
  "CN VI (Abducens) palsy – clinical features. Why is it a 'false localizing sign'?",
  "Always consider raised ICP when VI palsy found with no obvious cause");
addA(26,"CN Palsy",
  "CN VI (Abducens) Palsy:\n\n• Weakens: LATERAL RECTUS\n• Effect: ESOTROPIA (convergent squint)\n• Diplopia: Horizontal, UNCROSSED, worse on gaze toward affected side\n• Limitation of abduction\n\nFalse localizing sign in raised ICP:\n• CN VI has the LONGEST intracranial course\n• Stretched over petrous ridge when ICP raised\n• Palsy does NOT indicate where the SOL is → false localizing\n\nGradenigo Syndrome:\n• Petrous apex lesion (otitis media / mastoiditis complication)\n• CN VI palsy + facial pain (CN V) + ipsilateral middle ear disease",
  "CN VI = false localizing sign in raised ICP. Gradenigo = petrous apex (VI + V + ear).");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 6 – AION / GCA
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 6", "AION, GCA & Ischaemic Optic Neuropathy", "B71C1C", "0D1B2A");

addQ(27,"AION",
  "What is the typical visual field defect in AION? What is the 'disc at risk'?",
  "AION = altitudinal field defect (not hemianopia, not central scotoma)");
addA(27,"AION",
  "AION (Anterior Ischaemic Optic Neuropathy):\n\nVisual field defect: ALTITUDINAL (usually inferior)\n• Sudden visual loss, often noticed on waking\n• Painless\n\n'Disc at Risk' (NAION):\n• Small optic disc with SMALL or absent cup\n• Crowded nerve fibre arrangement\n• Congestion → ischaemia when systemic hypotension occurs\n• Often with DM, HTN, hyperlipidaemia, OSA\n\nContrast: Optic neuritis = central scotoma, RAPD, painful, young\nAION = altitudinal, RAPD, painless, older",
  "AION = altitudinal field defect + disc at risk + older patient. Painless.");

addQ(28,"AION / GCA",
  "GCA (Giant Cell Arteritis) – clinical features, investigation, and immediate treatment?",
  "DO NOT wait for biopsy results before starting steroids");
addA(28,"AION / GCA",
  "GCA (Arteritic AION) – age > 70 yr:\n\nSymptoms:\n• Headache (temporal), scalp tenderness\n• Jaw claudication (pathognomonic)\n• Temporal artery tender + non-pulsatile\n• Sudden severe visual loss (pale chalky disc)\n• Systemic: fever, weight loss, PMR symptoms\n\nInvestigations:\n• ESR > 50 mm/hr (often > 80), CRP raised\n• Temporal artery biopsy (skip lesions → take long segment)\n\nTreatment – IMMEDIATE:\n• IV methylprednisolone 1g/day × 3 days (if vision threatened)\n• Oral prednisolone 1 mg/kg if no visual loss\n• Aspirin 100 mg/day (reduces stroke/visual loss risk)\n• DO NOT wait for biopsy – start steroids at once",
  "GCA: jaw claudication + ESR >50 + sudden visual loss → IMMEDIATE IV steroids");

addQ(29,"AION",
  "Non-arteritic AION (NAION) vs Arteritic AION (GCA) – comparison.",
  "ESR and jaw claudication are the key differentiators");
addA(29,"AION",
  "Feature         | NAION               | AAION (GCA)\n─────────────── | ─────────────────── | ───────────────────────\nAge              | 50-70 yr            | > 70 yr\nESR/CRP          | Normal              | ELEVATED\nPain             | Painless            | Headache/scalp tender\nJaw claudication | No                  | YES (pathognomonic)\nDisc at risk     | YES (small cup)     | Not required\nFellow eye risk  | ~15% in 5 years     | VERY HIGH if untreated\nTreatment        | RF modification     | Immediate steroids\nBiopsy           | Not needed          | Temporal artery biopsy",
  "GCA: jaw claudication + ESR raised. NAION: disc at risk + normal ESR.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 7 – MIXED HIGH-YIELD PYQs
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 7", "Rapid-Fire High-Yield PYQ Scenarios", "004D40", "0D1B2A");

addQ(30,"PYQ Scenario",
  "30-year-old woman. Painful unilateral visual loss, pain on eye movement, RAPD present, disc appears NORMAL. Diagnosis?",
  "Normal disc + pain on eye movement = retrobulbar not papillitis");
addA(30,"PYQ Scenario",
  "RETROBULBAR OPTIC NEURITIS\n(Demyelinating – possible first presentation of MS)\n\nKey clues:\n• Young woman → demyelinating optic neuritis\n• Pain on eye movement → optic nerve sheath inflammation\n• RAPD → afferent optic nerve lesion\n• Normal disc → inflammation is POSTERIOR (retrobulbar)\n\nManagement:\n• MRI brain (look for demyelinating plaques)\n• IV methylprednisolone (speeds recovery)\n• Neurology referral for MS monitoring",
  "Pain on eye movement + RAPD + normal disc + young = retrobulbar optic neuritis / MS");

addQ(31,"PYQ Scenario",
  "65-year-old diabetic man. CN III palsy with NORMAL pupil. Cause? Is this an emergency?",
  "Pupil-sparing = microvascular. Dilated pupil = aneurysm = EMERGENCY");
addA(31,"PYQ Scenario",
  "MICROVASCULAR CN III PALSY\n(Diabetic/hypertensive – NOT an emergency)\n\nReasoning:\n• Normal (spared) pupil → central pupillomotor fibres NOT affected\n• In ischaemia: outer motor fibres affected (supplied by vasa nervorum)\n• Inner pupillomotor fibres (superficial) are spared\n\nManagement:\n• Control DM, HTN\n• Usually resolves in 3-4 months\n• If pupil becomes dilated later → urgent CTA to exclude aneurysm\n\nContrast: Any CN III palsy with dilated fixed pupil = aneurysm until proven otherwise",
  "Pupil-sparing CN III = microvascular (DM/HTN). NOT an emergency. Resolves in months.");

addQ(32,"PYQ Scenario",
  "75-year-old with sudden visual loss, jaw pain while chewing, temporal headache. ESR = 90. Urgent next step?",
  "Don't wait for biopsy – start steroids NOW");
addA(32,"PYQ Scenario",
  "GIANT CELL ARTERITIS (GCA)\n\nUrgent next step: IMMEDIATE IV methylprednisolone\n(Do NOT wait for biopsy results)\n\nWhy urgent?\n• Fellow eye at very high risk of ischaemia within hours-days\n• Once other eye loses vision, it is permanent\n• Biopsy can be done within 1-2 weeks of starting steroids\n  (histology remains positive for weeks)\n\nJaw claudication = pain when chewing = PATHOGNOMONIC of GCA\nESR > 50 (often > 80) = characteristic\n\nStart: IV methylprednisolone 1g/day + aspirin 100mg/day",
  "GCA: start IV steroids IMMEDIATELY. Don't wait for biopsy. Both eyes at risk.");

addQ(33,"PYQ Scenario",
  "Obese 25-year-old woman. Bilateral papilloedema, daily headache, diplopia. Normal CT and MRI. CSF opening pressure = 30 cmH₂O. Diagnosis and treatment?",
  "Diplopia = CN VI false localizing sign in raised ICP");
addA(33,"PYQ Scenario",
  "IDIOPATHIC INTRACRANIAL HYPERTENSION (IIH)\n\nDiagnosis confirmed by:\n• Young obese woman (classic demographic)\n• Bilateral papilloedema\n• Normal neuroimaging\n• Raised CSF pressure (>25 cmH₂O)\n• Normal CSF composition\n\nDiplopia → CN VI palsy = false localizing sign (raised ICP stretches CN VI)\n\nTreatment:\n1. WEIGHT LOSS (primary intervention – most effective)\n2. Acetazolamide (first-line medication)\n3. Topiramate (also causes weight loss)\n4. Optic nerve sheath fenestration (if vision threatened)\n5. LP/VP shunt (refractory cases)",
  "IIH: obese young woman + papilloedema + normal MRI + raised CSF pressure");

addQ(34,"PYQ Scenario",
  "A patient has right eye OPTIC ATROPHY and left eye PAPILLOEDEMA. Most likely diagnosis?",
  "Classic Foster Kennedy presentation");
addA(34,"PYQ Scenario",
  "FOSTER KENNEDY SYNDROME\n\nCause: Frontal lobe space-occupying lesion\n(MC = Olfactory groove meningioma)\n\nMechanism:\n• Ipsilateral optic atrophy: direct compression of ipsilateral optic nerve\n• Contralateral papilloedema: raised ICP from the expanding mass\n• + Ipsilateral anosmia (olfactory nerve compression)\n\nImportant contrast:\nPseudo-Foster Kennedy = sequential bilateral AION\n• Active AION one eye (swollen disc) + old AION other eye (atrophy)\n• NO raised ICP\n• No frontal SOL",
  "Ipsilateral atrophy + contralateral papilloedema = Foster Kennedy = frontal SOL");

addQ(35,"PYQ Scenario",
  "Young male with bilateral visual loss (sequential, painless), cecocentral scotoma, family history on MOTHER'S side only. Diagnosis?",
  "Maternal inheritance = mitochondrial = LHON");
addA(35,"PYQ Scenario",
  "LEBER HEREDITARY OPTIC NEUROPATHY (LHON)\n\nKey features here:\n• Young male (20-30 yr)\n• Bilateral painless visual loss, often sequential\n• Cecocentral scotoma (involving central vision + blind spot)\n• MATERNAL inheritance (mitochondrial DNA)\n\nMost common mutation: ND4 (position 11778)\n\nFundus:\n• Early: Peripapillary telangiectasia\n• Late: Primary optic atrophy\n\nAssociation: Cardiac conduction defects (WPW pattern)\nTreatment: Idebenone (modest benefit)\nGenetic counselling for maternal relatives",
  "LHON = maternal (mitochondrial) inheritance + young male + cecocentral scotoma");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 8 – ONE-LINER RAPID REVIEW
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 8", "One-Liner Rapid Review", "37474F", "0D1B2A");

addQ(36,"One-Liner",
  "What causes bitemporal hemianopia?",
  "Only ONE structure causes true bitemporal hemianopia");
addA(36,"One-Liner","Optic chiasm lesion ONLY\n\nMC cause: Pituitary adenoma (compresses chiasm from below)\nOther causes: Craniopharyngioma (children), meningioma, aneurysm\nNote: Superior bitemporal defect first = pituitary adenoma (grows up into chiasm)","Bitemporal hemianopia = chiasm only = pituitary adenoma (MC)");

addQ(37,"One-Liner",
  "What is the visual field defect in a complete optic tract lesion?",
  "Tract = first place where fibres from same side of both eyes combine");
addA(37,"One-Liner","Contralateral Homonymous Hemianopia (INCONGRUENT)\n\n• Incongruent because fibres are not fully sorted yet\n• Wernicke hemianopic pupil reaction may be present\n• Can cause bow-tie atrophy in both discs\n• Ipsilateral disc: superior + inferior pallor (temporal retinal fibres)\n• Contralateral disc: bow-tie (nasal + temporal nasal fibres)","Optic tract = incongruent homonymous hemianopia + possible RAPD");

addQ(38,"One-Liner",
  "Name the bright autofluorescent structure on fundus autofluorescence (FAF) that mimics papilloedema.",
  "");
addA(38,"One-Liner","Optic Disc DRUSEN\n\nDrusen = calcium deposits within the optic nerve head\n• Appear highly autofluorescent on FAF (bright)\n• Calcified on ultrasound (highly reflective)\n• Can mimic papilloedema clinically\n• BURIED drusen in CHILDREN = most dangerous mimic\n• FA: no leakage (vs papilloedema which leaks)","Disc drusen = bright on FAF + calcified on ultrasound = pseudopapilloedema");

addQ(39,"One-Liner",
  "Neuroretinitis: What does it look like on fundoscopy, and what is the MC infectious cause?",
  "Macular star is the key feature");
addA(39,"One-Liner","Neuroretinitis:\n• Optic disc SWELLING + MACULAR STAR\n• Macular star = hard exudates arranged in star pattern around macula (around fovea)\n• Arises from disc oedema tracking into outer plexiform layer\n\nMC cause: Bartonella henselae (Cat Scratch Disease)\nOther: Syphilis, Lyme disease, Toxoplasma\n\nDoes NOT progress to MS (unlike typical optic neuritis)","Neuroretinitis = disc swelling + macular star = Bartonella (cat scratch)");

addQ(40,"One-Liner",
  "What is Uhthoff's phenomenon and which condition is it associated with?",
  "");
addA(40,"One-Liner","Uhthoff's Phenomenon:\n• Transient worsening of vision with HEAT or EXERCISE\n• Associated with: DEMYELINATING OPTIC NEURITIS (MS)\n• Mechanism: Heat slows conduction in already-demyelinated fibres\n• Fully reversible when temperature normalises\n• Not a sign of disease progression","Uhthoff = vision worsens with heat/exercise = demyelinating optic neuritis / MS");

addQ(41,"One-Liner",
  "A patient after temporal lobe surgery has difficulty seeing objects in the upper part of the visual field on the opposite side. Name the structure damaged.",
  "");
addA(41,"One-Liner","Meyer's Loop (Inferior Optic Radiation – Temporal lobe)\n\n• Meyer's loop: inferior fibres of optic radiation that sweep forward into temporal lobe\n• These fibres carry information from the SUPERIOR visual field\n• Damage → Contralateral SUPERIOR homonymous quadrantanopia\n• 'Pie in the sky'\n• A complication of temporal lobe surgery or ATL for epilepsy","Meyer's loop damage = 'pie in the sky' = superior contralateral quadrantanopia");

addQ(42,"One-Liner",
  "Normal CSF opening pressure in adults (lying position)?",
  "IIH diagnosed when pressure > 25 cmH₂O in adults");
addA(42,"One-Liner","Normal CSF pressure (lumbar puncture, lateral decubitus/lying position):\n\n10 – 18 cmH₂O in adults\n\nIIH diagnostic threshold:\n• Adults: > 25 cmH₂O\n• Obese adults: > 28 cmH₂O\n\nNote: Measure in lateral decubitus (lying on side)\n• Upright position gives falsely high values","Normal CSF = 10-18 cmH₂O. IIH >25 cmH₂O (adults).");

addQ(43,"One-Liner",
  "What is Gradenigo syndrome? Which cranial nerves are involved?",
  "Petrous apex lesion – often complication of otitis media");
addA(43,"One-Liner","Gradenigo Syndrome (Petrous Apex Syndrome):\n\nTriad:\n1. CN VI palsy (lateral rectus weakness → horizontal diplopia)\n2. CN V involvement (facial/retro-orbital pain, trigeminal neuralgia)\n3. Ipsilateral middle ear disease (otitis media / mastoiditis)\n\nCause: Petrous apex osteomyelitis (complication of otitis media)\nAlso: Petrous apex tumours, cholesteatoma\n\nHistorical importance: Frequent NEET PG question","Gradenigo = CN VI + facial pain (V) + ear disease = petrous apex lesion");

addQ(44,"One-Liner",
  "What is the 'swinging flashlight test' finding in a left EFFERENT defect (CN III palsy on left)?",
  "Efferent defect ≠ RAPD – pupils are unequal but both respond sluggishly");
addA(44,"One-Liner","Left CN III Palsy (Efferent defect):\n• Left pupil is FIXED and DILATED at baseline\n• Swinging flashlight test:\n  – Light in right eye: RIGHT pupil constricts, left pupil does NOT constrict\n  – Light in left eye: RIGHT pupil constricts consensually, left pupil STILL does NOT constrict\n\nKey: The left pupil is ALWAYS dilated regardless of which eye is illuminated\n→ This is efferent, NOT RAPD\n\nRAPD: Both pupils react (constrict/dilate together), but dilate when diseased eye lit","Efferent defect: dilated pupil doesn't respond to ANY light. RAPD: both pupils react together.");

addQ(45,"One-Liner",
  "What is the significance of 'temporal pallor' of the optic disc?",
  "Most often linked to one very common clinical condition");
addA(45,"One-Liner","Temporal Pallor of Optic Disc:\n\n• Indicates atrophy of the PAPILLOMACULAR BUNDLE\n• These fibres enter the temporal aspect of the optic disc\n• Classic cause: Post-DEMYELINATING OPTIC NEURITIS\n  (temporal pallor is the residual sign after optic neuritis resolves)\n\nOther causes: toxic/nutritional optic neuropathy (alcohol-tobacco amblyopia, B12 deficiency)\n\nBand (bow-tie) atrophy = nasal AND temporal pallor → chiasm/tract lesion","Temporal pallor = papillomacular bundle loss = hallmark of post-demyelinating optic neuritis");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 9 – MNEMONICS & RAPID SUMMARY
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 9", "Mnemonics & Quick Summary Cards", "004D40", "0D1B2A");

addQ(46,"Mnemonic",
  "Give mnemonics for: (1) Horner syndrome features, (2) IIH drug causes, (3) Argyll Robertson pupil.",
  "These mnemonics appear directly in PYQ explanations");
addA(46,"Mnemonic",
  "1. Horner Syndrome – 'PAM':\n   Ptosis (partial) + Anhidrosis + Miosis\n\n2. IIH Drug Causes – 'TOVA':\n   Tetracyclines / OCP+Obesity / Vitamin A (retinoids) / Adrenal insufficiency (steroid withdrawal)\n\n3. Argyll Robertson – 'ARLA':\n   Accommodation Retained, Light Absent\n   OR: 'Prostitute's pupil – accommodates but doesn't react'\n\n4. CN III palsy positions:\n   '3 Ps': Ptosis + Paralysis (down & out) + Pupil dilated (if surgical)",
  "PAM (Horner) | TOVA (IIH drugs) | ARLA (AR pupil)");

addQ(47,"Summary",
  "Rank the 5 visual pathway lesions by CONGRUITY of the homonymous defect they produce.",
  "More posterior = more congruent");
addA(47,"Summary",
  "Congruity (LEAST → MOST):\n\n1. Optic tract: Most INCONGRUENT homonymous hemianopia\n2. Anterior optic radiation (temporal/parietal): Incongruent quadrantanopia\n3. Posterior optic radiation: More congruent quadrantanopia\n4. Occipital cortex: Most CONGRUENT homonymous hemianopia\n   + MACULAR SPARING (if PCA territory spared)\n\nRule: More POSTERIOR = more CONGRUENT\nRule: Macular sparing = ONLY with occipital cortex lesions",
  "Tract = incongruent. Cortex = most congruent + macular sparing");

addQ(48,"Summary",
  "What are the 3 causes of light-near dissociation (intact near, absent light reflex)?",
  "Syphilis is the classic but there are 3 main causes");
addA(48,"Summary",
  "LIGHT-NEAR DISSOCIATION\n(Near reflex intact; light reflex ABSENT/reduced)\n\n3 Main Causes:\n1. Argyll Robertson pupil (NEUROSYPHILIS)\n   – Bilateral small pupils\n2. Dorsal midbrain (Parinaud) syndrome\n   – Bilateral large pupils + upgaze palsy + convergence-retraction nystagmus\n3. Adie's (Tonic) pupil\n   – Unilateral large pupil, tonic slow near response\n\nAlso: Diabetes (incomplete AR pattern), MS, Lyme disease",
  "Light-near dissociation: Argyll Robertson (syphilis) | Parinaud (dorsal midbrain) | Adie");

addQ(49,"Summary",
  "Parinaud Dorsal Midbrain Syndrome – features?",
  "Upgaze palsy + convergence-retraction nystagmus = Parinaud");
addA(49,"Summary",
  "Parinaud Syndrome (Dorsal Midbrain):\n\nClassic Triad:\n1. UPGAZE PALSY (cannot look up – supranuclear)\n2. CONVERGENCE-RETRACTION nystagmus on attempted upgaze\n3. LIGHT-NEAR DISSOCIATION (bilateral dilated pupils)\n\nAdditional:\n• Eyelid retraction (Collier sign / 'setting sun' eyes in children)\n• Skew deviation\n\nCauses:\n• Pineal gland tumour (MC in young adults)\n• Hydrocephalus (aqueduct compression)\n• MS, infarction\n\nNote: These are large pupils (unlike AR = small pupils)","Parinaud = upgaze palsy + convergence-retraction nystagmus + dilated pupils = pineal tumour");

addQ(50,"Summary",
  "FINAL CARD: Recall the 10 most important one-liners for NEET PG neuro-ophthalmology.",
  "These are the highest-yield, exam-ready facts");
addA(50,"Summary",
  "Top 10 One-Liners:\n1. Bitemporal hemianopia = chiasm only = pituitary adenoma MC\n2. Macular sparing = occipital cortex infarct (PCA)\n3. Pie in sky = temporal (Meyer's loop); Pie on floor = parietal\n4. RAPD = optic nerve disease (afferent lesion)\n5. Dilated pupil CN III = aneurysm (PCom) – EMERGENCY\n6. Spared pupil CN III = microvascular (DM/HTN) – NOT emergency\n7. GCA: jaw claudication + ESR raised → immediate IV steroids\n8. IIH: obese young woman + bilateral papilloedema + normal MRI\n9. Argyll Robertson: small pupils, no light reflex, intact near = syphilis\n10. LHON: maternal inheritance, young male, cecocentral scotoma",
  "Revise these 10 daily for the week before NEET PG 2026!");

// ── Write file ────────────────────────────────────────────────────────────────
pres.writeFile({ fileName: "/home/daytona/workspace/neuro-ophtho-flashcards/NeuroOphtho_Flashcards_NEETPG2026.pptx" })
  .then(() => console.log("SUCCESS: PPTX created."))
  .catch(e => console.error("ERROR:", e));

Running Command

cd /home/daytona/workspace/neuro-ophtho-flashcards && node flashcards.js

Running Command

ls -lh /home/daytona/workspace/neuro-ophtho-flashcards/

Your flashcard deck is ready! 🎉

NeuroOphtho Flashcards NEETPG2026

Presentation · PPTX

What's inside (1.3 MB, 110 slides)

The deck follows a Question (dark navy) → Answer (light teal) format for every card, with colour-coded category tags, question number badges, and a highlighted key-point footer on each answer.

Section	Cards	Topics Covered
1	5	Visual Field Defects (all 5 pathway levels)
2	5	Papilloedema, IIH, Pseudo-papilloedema, Foster Kennedy
3	7	Pupil disorders - RAPD, Adie, Argyll Robertson, Horner
4	5	Optic neuritis, optic atrophy, LHON
5	4	CN III / IV / VI palsies - surgical vs medical
6	3	AION, GCA, NAION vs AAION
7	6	Full clinical PYQ scenarios (solved)
8	10	Rapid one-liners - Gradenigo, Uhthoff, neuroretinitis, etc.
9	5	Mnemonics, congruity ranking, Parinaud, top 10 summary

How to use: Present in slideshow mode - see the question, pause to recall, then advance for the answer. Works great on phone/tablet for on-the-go revision!

Now switch to aretina in same format

Reading File

Now let me search for retina content in parallel - high-yield NEET PG retina topics:

Finding Sources

Good - now read the Kanski retina section and also search for remaining high-yield topics in parallel:

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Finding Sources

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Finding Sources

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I have enough content from textbooks + my expert medical knowledge. Now let me build the full retina flashcard deck:

First teach me like u did earlier pyt based for neet pg 2026 retina chapter then inwill go thru flashcard eck

Finding Sources

Searching the Web

retina NEET PG 2024 2025 previous year questions high yield topics PYQ

Now let me pull the key Kanski retina sections - diabetic retinopathy classification, RD, CRAO/CRVO, AMD, retinoblastoma:

Reading File

Finding Sources

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Finding Sources

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Finding Sources

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Finding Sources

Reading File

I have rich Kanski data. Now let me compile the full teaching guide:

🔴 Retina for NEET PG 2026 - Complete PYQ-Based Guide

Based on Kanski's Clinical Ophthalmology 10th Ed (pp. 522-696), Robbins Pathology, Harrison's 22nd Ed, and NEET PG 2024-25 PYQ trends.

📋 High-Yield Topic Priority List

Rank	Topic	PYQ Frequency
1	Diabetic Retinopathy (classification + treatment)	⭐⭐⭐⭐⭐
2	Retinal Detachment (types + features + surgery)	⭐⭐⭐⭐⭐
3	CRAO + CRVO (clinical features + fundus)	⭐⭐⭐⭐⭐
4	Retinoblastoma	⭐⭐⭐⭐
5	AMD (dry vs wet + treatment)	⭐⭐⭐⭐
6	Hypertensive Retinopathy (Keith-Wagener grading)	⭐⭐⭐⭐
7	PVD + Vitreous Haemorrhage	⭐⭐⭐
8	Retinitis Pigmentosa	⭐⭐⭐
9	Retinopathy of Prematurity (ROP)	⭐⭐⭐
10	Macular disorders (CSR, ERM, macular hole)	⭐⭐⭐

1. DIABETIC RETINOPATHY (DR) - Most Tested Topic

Pathogenesis

DR is primarily a microangiopathy. Key mediator = VEGF (Vascular Endothelial Growth Factor). Chronic hyperglycaemia → pericyte loss → microaneurysm formation → breakdown of blood-retinal barrier.

Classification (ETDRS / Kanski)

Stage	What You See on Fundus	Management
No DR	Normal	Review 12 months
Very mild NPDR	Microaneurysms ONLY	Review 12 months
Mild NPDR	Microaneurysms + dot/blot haemorrhages + hard exudates	Review 6-12 months
Moderate NPDR	Above + cotton-wool spots, mild IRMA	Review 3-6 months
Severe NPDR (Preproliferative)	4-2-1 Rule (see below)	Urgent review, consider PRP
PDR	Neovascularization (NVD or NVE)	PRP / Anti-VEGF
High-risk PDR	Any NVD, OR NVD >1/3 disc area, OR NVE >1/2 disc area + VH	PRP urgently
Advanced	Tractional RD, persistent VH, NVG	Vitrectomy

4-2-1 Rule for Severe NPDR (ANY ONE of these = Severe NPDR):

4 quadrants of diffuse retinal haemorrhages
2 quadrants of venous beading
1 quadrant of IRMA (Intraretinal Microvascular Anomalies)

PYQ KEY: 4-2-1 rule = severe NPDR. ANY patient with severe NPDR has 50% chance of progressing to PDR within 1 year.

Fundus Signs - What They Mean

Sign	Significance
Microaneurysms	First sign of DR - sacculae outpouchings of capillary walls
Dot haemorrhages	From microaneurysms (in inner nuclear layer)
Blot haemorrhages	From deeper capillaries (outer plexiform layer)
Hard exudates	Lipid + protein leakage from damaged vessels (yellow, well-defined edges)
Cotton-wool spots	Ischaemic nerve fibre layer infarcts (fluffy white, ill-defined) - indicate ISCHAEMIA
IRMA	Intraretinal blood vessel remodelling - sign of ischaemia, precedes NV
Venous beading	Tortuous, irregular calibre veins - severe ischaemia
NVD	New vessels on/within 1 DD of optic disc
NVE	New vessels elsewhere (not at disc)

PYQ TRAP: Hard exudates = lipid leakage (NOT ischaemia). Cotton-wool spots = ischaemia/infarction.

Diabetic Maculopathy - The Main Cause of Vision Loss in NPDR

Clinically Significant Macular Oedema (CSMO) - defined as:

Retinal thickening within 500 μm of fovea centre, OR
Hard exudates within 500 μm of fovea with adjacent retinal thickening, OR
Retinal thickening > 1 disc area, any part within 1 disc diameter of fovea

Treatment of CSMO / Diabetic Macular Oedema:

First-line: Intravitreal anti-VEGF (ranibizumab, bevacizumab, aflibercept)
Second-line: Intravitreal steroids (triamcinolone, dexamethasone implant)
Focal/grid macular laser (less used now)

PYQ KEY: Macula oedema in DM → anti-VEGF first. If PDR + macular oedema coexist → treat macular oedema FIRST, then PRP.

Treatment of PDR

Panretinal Photocoagulation (PRP):

Burns applied to peripheral retina (outside arcades)
Destroys ischaemic retina → reduces VEGF → NV regresses
1500-2000 burns, sparing 2 disc diameters nasal to disc and macular arcades
Protocol S: Anti-VEGF (ranibizumab) non-inferior to PRP for PDR up to 5 years

Anti-VEGF for PDR: Equally effective as PRP; avoid if poor follow-up likely.

2. HYPERTENSIVE RETINOPATHY

Keith-Wagener-Barker Classification

Grade	Features	Systemic Correlation
Grade I	Mild arteriolar narrowing, increased arteriolar light reflex	Mild HTN
Grade II	Definite arteriolar narrowing + AV nipping (nicking) + copper/silver wire appearance	Moderate HTN
Grade III	Grade II + flame haemorrhages + cotton-wool spots + hard exudates	Severe HTN
Grade IV	Grade III + papilloedema	Hypertensive encephalopathy/crisis

PYQ KEY: AV nipping (nicking) = Grade II. Papilloedema = Grade IV.

AV Changes in Detail (Gunn's signs):

Sign	Grade
Silver wire arterioles	Grade I-II (increased light reflex from thickened wall)
Copper wire arterioles	Earlier change (less severe than silver)
AV nipping (Gunn's sign)	Grade II - arteriole compresses vein at crossing
Salus sign	AV crossing - vein deflected
Bonnet sign	AV crossing - vein humped
Scheie sign	AV crossing - vein tapered (banking)

Memory: Copper → Silver (progression). AV nipping = Grade 2. Flame haem + CWS = Grade 3. Disc swelling = Grade 4.

Macular Star

Hard exudates arranged in stellate pattern around macula - seen in Grade III-IV hypertensive retinopathy. Also seen in papilloedema, neuroretinitis.

3. RETINAL VASCULAR OCCLUSIONS

CRAO - Central Retinal Artery Occlusion

Presentation: Sudden, PAINLESS, monocular visual loss (complete)

Fundus (Classic Signs):

Milky white/grey opacification of entire retina (ischaemic oedema of inner retinal layers)
Cherry-red spot at fovea (fovea gets blood from choroidal vessels via RPE - appears red against white retina)
Boxcar segmentation of blood in arteries (cattle-trucking)
Arteries very narrow, barely visible
RAPD present

PYQ KEY: Cherry-red spot at fovea = CRAO. Why? Fovea lacks inner retinal layers (only outer layers supplied by choroid). Surrounding retina is white/opaque from inner retinal oedema.

Other causes of cherry-red spot:

Tay-Sachs disease (GM2 gangliosidosis) - storage disease
Niemann-Pick disease
Sandhoff disease
Central retinal artery occlusion
Quinine toxicity

Causes of CRAO:

Embolism (MC): from carotid atheromatous plaque (Hollenhorst plaques = cholesterol emboli, refractile yellow)
Thrombosis
GCA (1-2% of CRAO - important in elderly)
Atrial fibrillation
Vasospasm (migraine, young patients)

Treatment of CRAO (within 4.5 hours ideally):

Lower IOP (ocular massage, IV acetazolamide, anterior chamber paracentesis)
Inhale CO₂ + O₂ mixture (vasodilate)
Intra-arterial thrombolysis (if within 4.5 hrs)
Urgent cardiology/neurology referral (25% stroke risk at 3 years)

PYQ KEY: CRAO = ophthalmic emergency. Urgent cardiovascular evaluation to prevent stroke.

BRAO - Branch Retinal Artery Occlusion

Sector of white retinal oedema corresponding to territory of occluded branch
Altitudinal or sector visual field defect
Hollenhorst plaque (cholesterol embolus) often visible at bifurcation
Prognosis better than CRAO

CRVO - Central Retinal Vein Occlusion

Presentation: Sudden painless visual loss (often less severe than CRAO)

Fundus (Classic "Blood and Thunder"):

Flame-shaped haemorrhages in ALL 4 quadrants (most extensive haemorrhages possible)
Disc swelling (hyperaemia, blurred margins)
Dilated tortuous veins ("sausage links")
Cotton-wool spots
Macular oedema

PYQ: "Blood and thunder fundus" = CRVO

Classification of CRVO:

Type	Features	Consequence
Non-ischaemic (perfused)	VA > 6/60, no RAPD or mild, < 10 DD of non-perfusion on FA	Better prognosis, less NV
Ischaemic (non-perfused)	VA < 6/60, RAPD, > 10 DD non-perfusion on FA	High risk of NVG (100 day glaucoma)

Neovascular Glaucoma (NVG) / "100-day glaucoma":

Occurs ~3 months after ischaemic CRVO
VEGF from ischaemic retina → rubeosis iridis (NVI) + NVA → closed-angle glaucoma
Treatment: PRP + anti-VEGF + IOP control

Treatment of CRVO:

Macular oedema: Intravitreal anti-VEGF (first-line) or steroids
Ischaemic CRVO: PRP + monitor for NVI

Risk factors for CRVO: HTN (MC), DM, hyperlipidaemia, open-angle glaucoma, hyperviscosity

BRVO - Branch Retinal Vein Occlusion

Sector haemorrhage (typically superotemporal quadrant - MC site)
Haemorrhages, exudates in one quadrant
AV crossing site (HTN causes vein compression)
Macular oedema is the main cause of vision loss
Treatment: Anti-VEGF for macular oedema; laser for NVE

PYQ KEY: BRVO MC at superotemporal AV crossing. HTN is MC risk factor.

4. RETINAL DETACHMENT (RD)

Classification - The Most Tested Part

Type	Mechanism	Subretinal Fluid	Features
Rhegmatogenous (RRD)	Full-thickness retinal BREAK → liquefied vitreous enters subretinal space	From vitreous (via break)	Most common type. Corrugated, opaque, mobile retina
Tractional (TRD)	Fibrovascular membranes pull NSR away from RPE - NO break	Formed locally	Concave configuration, taut surface. Caused by PDR, sickle cell, trauma
Exudative (Serous)	Fluid from vessels of NSR/choroid accumulates - NO break	From vessels/choroid	Smooth, shifting fluid. Caused by VKH, choroidal tumours, posterior scleritis, Coats disease
Combined TRD + RRD	Fibrovascular traction creates a break → both mechanisms	Both	Worst form in PDR

PYQ KEY: RRD = most common type. Has a BREAK. TRD = no break, concave retina. Exudative = shifting subretinal fluid (gravity-dependent).

Rhegmatogenous RD - Key Features

Predisposing factors:

High myopia (MC risk factor)
Previous cataract surgery (aphakia/pseudophakia)
Trauma
Lattice degeneration (horseshoe tears)
PVD (posterior vitreous detachment) - commonest cause of breaks

Symptoms (classic sequence):

Flashes (photopsias) - vitreous traction on retina
Floaters - vitreous syneresis, tobacco dust (pigment cells = Shafer's sign)
Shadow/curtain - from the edge (visual field loss progressing toward centre)
Central vision loss - when macula detaches

PYQ KEY: Flashes → floaters → field defect → visual loss = sequence of RRD. "Tobacco dust" (Shafer's sign) in anterior vitreous = pathognomonic of RRD.

Fundus signs of RRD:

Retina elevated, opalescent (greyish), corrugated/undulating
Loss of underlying choroidal pattern
Retinal break visible (red against grey retina)
IOP often lower than normal eye
RAPD in extensive RD
"Tobacco dust" in vitreous

Macula-on vs macula-off RD:

Macula-on: surgical emergency (within hours) - good prognosis
Macula-off: urgent (within days) - visual prognosis worse, especially if > 24-48 hours

Surgical Treatment of RRD

Procedure	Mechanism	Indications
Scleral buckling	External indentation compresses break, seals it	Peripheral breaks, young patients with no PVR
Vitrectomy (PPV)	Internal: remove vitreous, drain SRF, laser/cryo, gas tamponade	Posterior breaks, complex RD, PVR
Pneumatic retinopexy	Intravitreal gas bubble + laser/cryo	Single superior break, no PVR, phakic
Laser photocoagulation/cryotherapy	Seal breaks prophylactically	Symptomatic tears without RD

Gas tamponades: SF6 (sulphur hexafluoride) - persists 2 weeks; C3F8 - persists 8-12 weeks. Patient must maintain specific head posture.

PVR (Proliferative Vitreoretinopathy) = fibrous membranes on retinal surface → contraction → re-detachment. Main cause of surgical failure.

Lattice Degeneration

Most common peripheral retinal degeneration predisposing to RRD
White lattice lines + thinned retina + pigment at edges
Oval/elongated lesion parallel to ora serrata
Associated with myopia and Stickler syndrome (hereditary)
Treatment: Prophylactic laser if symptomatic/high-risk

5. AGE-RELATED MACULAR DEGENERATION (AMD)

Classification

Type	Also Called	Pathology	VA	Treatment
Dry AMD	Atrophic / Non-neovascular	Drusen → RPE atrophy → geographic atrophy	Slowly progressive	Supplements (AREDS2), low vision aids
Wet AMD	Exudative / Neovascular	Choroidal neovascularization (CNV) breaks through Bruch's membrane → rapid vision loss	Sudden, severe	Anti-VEGF (first-line)

PYQ KEY: 90% of AMD is dry (most common); 90% of severe visual loss is from wet AMD.

Drusen

Extracellular deposits between RPE and Bruch's membrane
Hard drusen: Small, discrete, well-defined - relatively benign
Soft drusen: Large, confluent, ill-defined - HIGH RISK for CNV (wet AMD)

Wet AMD - Features

Sudden distortion of vision (metamorphopsia - straight lines appear wavy)
Amsler grid test: patient reports wavy/missing lines
Subretinal haemorrhage, grey-green subretinal membrane
RPE detachment (PED)
FA/OCT shows active CNV

Treatment - Anti-VEGF Agents:

Ranibizumab (Lucentis): anti-VEGF Fab fragment
Bevacizumab (Avastin): full anti-VEGF antibody (off-label but widely used)
Aflibercept (Eylea): VEGF-trap; less frequent injections
Route: Intravitreal injection (monthly × 3 loading doses, then PRN/treat-and-extend)

PYQ KEY: Amsler grid → detect metamorphopsia → wet AMD. Anti-VEGF = treatment of wet AMD.

AREDS2 Supplements for Dry AMD

For intermediate or advanced AMD in one eye:

Vitamin C + Vitamin E + Zinc + Copper + Lutein + Zeaxanthin (replaces beta-carotene in AREDS2)
Reduces progression risk by ~25%

6. RETINOBLASTOMA

Key Facts

Feature	Detail
Most common intraocular tumour	In CHILDREN (under 5 years)
Genetics	RB1 gene (chromosome 13q14) - tumour suppressor gene - BOTH copies lost (Knudson's "two-hit hypothesis")
Bilateral	40% bilateral = hereditary (AD) → germline mutation
Unilateral	60% unilateral - majority sporadic (somatic mutation)
Most common presentation	Leukocoria (white pupil reflex) - 60%
Second most common	Strabismus (squint)

Knudson's Two-Hit Hypothesis

Hereditary (bilateral): First hit = germline mutation (inherited); Second hit = somatic mutation in retinal cell → BILATERAL, EARLIER onset, MULTIFOCAL
Sporadic (unilateral): Both hits occur somatically in ONE retinal cell → UNILATERAL, later onset, UNIFOCAL

PYQ KEY: Bilateral retinoblastoma = ALWAYS hereditary. All bilateral patients should have genetic screening of family.

Presentations

Presentation	Frequency	Notes
Leukocoria	60% MC	White pupil reflex - "cat's eye reflex"
Strabismus	20%	Due to macular involvement → poor fixation
Red painful eye	Rare	Advanced disease
Proptosis	Very rare	Extraocular extension

PYQ KEY: Leukocoria in a child → Retinoblastoma until proven otherwise. Differentials: PHPV, Coats disease, ROP, toxocariasis, cataract.

Calcification

Calcification in retinoblastoma on CT scan = pathognomonic - "cottage cheese" calcification
Ultrasound also shows calcification with acoustic shadowing

Staging and Treatment

Group (IIRC Classification)	Features	Treatment
Group A	Small tumours (< 3mm), no vitreous seeding	Focal therapy (laser, cryo)
Group B	Larger tumours, macular/subretinal fluid	Chemotherapy (ChRC) + focal
Group C	Discrete seeding	ChRC + focal
Group D	Diffuse vitreous/subretinal seeding	ChRC ± salvage
Group E	Extensive disease, NVG, phthisis	Enucleation

Treatment principles:

Unilateral group E: Enucleation (primary treatment)
Bilateral: Treat better eye conservatively; enucleate the worse eye if needed
Chemoreduction (ChRC): Vincristine + Carboplatin + Etoposide (VCE regimen)
Focal: Laser photocoagulation, cryotherapy, plaque brachytherapy
External beam radiotherapy (EBR): Avoided now (second malignancy risk in Rb1 germline)

PYQ KEY: Unilateral advanced (Group E) = enucleation. Bilateral = chemoreduction first to try to save eyes. EBR avoided because Rb1 mutation carriers have high risk of second malignancies (osteosarcoma).

Trilateral Retinoblastoma

Bilateral retinoblastoma + pineal gland tumour (primitive neuroectodermal tumour)
Poor prognosis
Pineal gland is sometimes called the "third eye"

7. POSTERIOR VITREOUS DETACHMENT (PVD)

Age-related separation of vitreous gel from retina (posterior hyaloid detaches)
Prevalence increases with age: <10% under 50 yr; >66% over 70 yr
Also triggered by: cataract surgery, trauma, uveitis, myopia

Symptoms:

Flashes (photopsias) - from vitreoretinal traction
Floaters - usually ring-shaped ("Weiss ring" = ring of glial tissue around optic disc)

Complication: Can cause retinal tears (horseshoe tears) → leads to RRD if untreated

PYQ: PVD → check periphery for tears → treat tears with laser/cryo prophylactically.

8. RETINITIS PIGMENTOSA (RP)

Feature	Detail
Inheritance	AD (most common), AR, X-linked (most severe)
Primary defect	Rod photoreceptor degeneration → progressive peripheral vision loss
Earliest symptom	Night blindness (nyctalopia)
Visual field	Tunnel vision (ring scotoma → progresses to central)
Fundus	Bone spicule pigmentation (peripheral) + Attenuated vessels + Waxy disc pallor
ERG	Reduced or extinguished (rods affected first)
Association	Usher syndrome (RP + deafness), Laurence-Moon-Biedl syndrome, Kearns-Sayre syndrome

PYQ KEY: Triad = bone spicule pigmentation + attenuated vessels + waxy disc pallor. Night blindness = first symptom.

Usher Syndrome: Autosomal recessive, RP + sensorineural deafness.

Laurence-Moon-Biedl syndrome: RP + obesity + polydactyly + hypogonadism + intellectual disability.

9. RETINOPATHY OF PREMATURITY (ROP)

Feature	Detail
Risk factors	Prematurity (< 28 weeks), low birth weight (< 1500g), supplemental O₂
Mechanism	Oxygen → inhibits VEGF → vessel arrest → later ischaemia → VEGF surge → neovascularization
Classification	Zones I-III (I = posterior, III = peripheral) + Stages 1-5 (Stage 5 = total funnel RD)
Plus disease	Vascular dilation + tortuosity of posterior pole vessels = active, severe disease

Treatment thresholds:

Type 1 ROP (treat): Zone I any stage + plus disease, OR Zone I Stage 3, OR Zone II Stage 2-3 + plus
Type 2 ROP (observe): Zone I Stage 1-2 no plus, Zone II Stage 3 no plus

Treatment:

Laser photocoagulation (to avascular retina) - standard
Intravitreal anti-VEGF (bevacizumab): especially for Zone I ROP; allows continued vascularisation

Screening schedule (India/UK): First exam at 4 weeks postnatal age OR 31 weeks PMA (whichever is later), then every 1-2 weeks.

PYQ KEY: Excess O₂ → ROP. Zone I = worst prognosis. Stage 5 = total funnel-shaped RD (very poor VA outcome).

10. CENTRAL SEROUS CHORIORETINOPATHY (CSR/CSCR)

Feature	Detail
Typical patient	Young to middle-aged male, type-A personality, stressed
Pathology	Focal RPE defect → serous fluid accumulates under neurosensory retina
Symptoms	Unilateral blurred vision, micropsia, metamorphopsia, central scotoma
Fundus	Dome-shaped neurosensory detachment (shallow, well-defined)
FA	"Smokestack" or "ink blot" pattern of leakage
OCT	Subretinal fluid + RPE detachment
Association	Corticosteroids (both systemic and topical/inhaled), stress, Cushing's
Course	Usually resolves spontaneously in 3 months
Treatment	Observe; focal laser if leak far from fovea; PDT (photodynamic therapy) for chronic/recurrent

PYQ KEY: Young stressed male + smokestack pattern on FA = CSR. Steroid use is a major trigger.

11. COATS DISEASE

Feature	Detail
Who	Young males, unilateral, non-hereditary
Pathology	Retinal telangiectasia + exudation
Presentation	Leukocoria (must differentiate from retinoblastoma), strabismus
Fundus	Massive subretinal exudate ("cholesterol crystals"), tortuous telangiectatic vessels
Differentiation from Rb	Coats = NO calcification on CT. Rb = calcification on CT
Treatment	Laser/cryo to telangiectatic vessels, anti-VEGF, vitrectomy

PYQ KEY: Coats vs Retinoblastoma differentiation - Coats has NO calcification (CT = key differentiator).

12. HIGH-YIELD PYQ QUESTIONS - SOLVED

Q1. What is the earliest sign of diabetic retinopathy on fundoscopy? → Microaneurysms (small saccular outpouchings of retinal capillaries)

Q2. 4-2-1 rule in diabetic retinopathy: what stage does it define and what is the implication? → Defines Severe NPDR (pre-proliferative). ANY ONE criterion = severe NPDR = 50% risk of PDR within 1 year → urgent review ± PRP.

Q3. Diabetic patient with macular oedema AND proliferative retinopathy: what do you treat first? → Treat macular oedema FIRST (anti-VEGF), then PRP for PDR. PRP can worsen macular oedema.

Q4. Fundus: entire retina white/opaque, bright cherry-red spot at fovea, arteries barely visible. Diagnosis? → Central Retinal Artery Occlusion (CRAO). Emergency. Urgent cardiovascular workup.

Q5. "Blood and thunder fundus" with flame haemorrhages in all 4 quadrants and disc swelling. Diagnosis? → Central Retinal Vein Occlusion (CRVO)

Q6. Patient with ischaemic CRVO develops painful red eye with raised IOP at 3 months. What has happened? → Neovascular Glaucoma (100-day glaucoma) - VEGF from ischaemic retina → rubeosis iridis → closed-angle. Needs PRP + anti-VEGF + IOP control.

Q7. Young myopic patient with flashes, then floaters, then curtain coming from below. Fundus: grey elevated retina with corrugated surface. Diagnosis and urgency? → Rhegmatogenous Retinal Detachment (RRD). Macula-on = surgical emergency (hours). Macula-off = urgent within days.

Q8. "Tobacco dust" in anterior vitreous. What is this and what does it signify? → Shafer's sign - pigment cells (from RPE) in anterior vitreous = almost pathognomonic of rhegmatogenous retinal detachment (or break).

Q9. Child with white pupil reflex (leukocoria). Most common diagnosis in a child under 5 years? → Retinoblastoma. Confirmed by CT (calcification = pathognomonic). Urgent ophthalmology referral.

Q10. Bilateral retinoblastoma: mode of inheritance and gene involved? → Autosomal dominant, RB1 gene on chromosome 13q14. Two-hit hypothesis (Knudson). Bilateral = always hereditary germline mutation.

Q11. Grade II hypertensive retinopathy on fundoscopy: what is the key sign? → AV nipping (arteriovenous nicking) - thickened arteriole compresses vein at crossing point.

Q12. Which retinopathy grade has papilloedema? → Grade IV (Keith-Wagener) - hypertensive encephalopathy/crisis. Urgent antihypertensive treatment.

Q13. Young woman on steroids develops unilateral blurred vision, metamorphopsia, central scotoma. FA shows smokestack pattern. Diagnosis? → Central Serous Chorioretinopathy (CSCR). Steroid use is a major precipitant. Stop steroids if possible.

Q14. ROP - what is the dangerous Zone, and what is plus disease? → Zone I = most posterior = worst prognosis. Plus disease = vascular dilation + tortuosity = active/aggressive ROP requiring treatment.

Q15. Night blindness + bone spicule pigmentation + attenuated vessels + waxy disc pallor. Inheritance? → Retinitis Pigmentosa. AD (most common), AR, X-linked (most severe). RP + deafness = Usher syndrome.

13. RAPID REVISION TABLE - ONE-LINERS

Condition	Key One-liner
Microaneurysms	First sign of DR
Cotton-wool spots	Ischaemic infarcts of NFL; indicate ischaemia (NOT lipid)
Hard exudates	Lipid leakage; yellow, well-defined edges
CSMO	Treat with anti-VEGF first
4-2-1 rule	= Severe NPDR; 50% → PDR within 1 yr
PRP	Peripheral retina ablation; 1500-2000 burns
CRAO	Cherry-red spot; milky white retina; RAPD; emergency
CRVO	Blood and thunder; all 4 quadrants; disc swelling
100-day glaucoma	Ischaemic CRVO → NVG at ~3 months
RRD	Corrugated, opaque retina; tobacco dust = Shafer's sign
TRD	Concave, taut retina; NO break; caused by PDR
Exudative RD	Smooth, shifting fluid; NO break; Coats, VKH, tumour
Lattice degeneration	MC peripheral degeneration → RRD; associated with myopia
Dry AMD	Drusen + geographic atrophy; AREDS2 supplements
Wet AMD	CNV; metamorphopsia; anti-VEGF (ranibizumab/bevacizumab)
Amsler grid	Tests central vision/metamorphopsia; detects wet AMD
Retinoblastoma	Leukocoria (60%) + strabismus (20%); CT calcification
Bilateral Rb	Always hereditary; RB1 gene 13q14; two-hit Knudson
KWB Grade II	AV nipping
KWB Grade IV	Papilloedema
Coats vs Rb	Coats = no calcification; Rb = calcification on CT
CSR	Young stressed male; smokestack FA; steroid association
ROP	Prematurity + O₂ = ROP; Zone I worst; anti-VEGF for Zone I
RP	Night blindness first; bone spicules; Usher syndrome (+ deafness)
Shafer's sign	Tobacco dust in vitreous = RRD
Macular sparing	Occipital infarct (not retinal!)

14. MNEMONICS

CRAO vs CRVO:

CRAO = Cherry Red (artery occlusion = red spot)
CRVO = Crimson Red everywhere (blood and thunder)

DR stages: "No Mild Moderate Severe Prolif" = N-M-M-S-P

4-2-1 Rule: "Four Haem, Two Vein, One IRMA" = Severe NPDR

RD types: "Rheg Tracts Exit" = Rhegmatogenous / Tractional / Exudative

Retinoblastoma genetics: "13 is unlucky (13q14) - loses both eyes to Rb"

KWB grading: "1 = narrow, 2 = nip, 3 = flame, 4 = papilloedema"

Leukocoria differentials: "RCTP" = Retinoblastoma / Coats / Toxocara / PHPV (persistent hyaloid)

Sources: Kanski's Clinical Ophthalmology 10th Ed, pp. 522-696 | Harrison's Principles of Internal Medicine 22nd Ed | Robbins Pathology | NEET PG 2024-25 PYQ trends (DigiNerve, PrepLadder)

Flashcard deck for this topic

Running Command

ls /home/daytona/workspace/

Running Command

mkdir -p /home/daytona/workspace/retina-flashcards

Writing File

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  "This is a classic PYQ trap – opposite mechanisms");
addA(2,"Diabetic Retinopathy",
  "Cotton-Wool Spots:\n• Fluffy, white, ill-defined edges\n• = ISCHAEMIC infarcts of nerve fibre layer\n• Blocked axoplasmic transport → cystoid bodies\n• Indicate retinal ISCHAEMIA (= preproliferative change)\n\nHard Exudates:\n• Bright yellow, well-defined edges\n• = LIPID + PROTEIN leakage from damaged vessels\n• Indicate macular oedema / blood-retinal barrier breakdown\n• Found at edges of oedema (especially in 'circinate' rings)\n• Do NOT indicate ischaemia",
  "Cotton-wool = ISCHAEMIA (fluffy, ill-defined). Hard exudates = LIPID LEAKAGE (yellow, sharp edges).");

addQ(3,"Diabetic Retinopathy",
  "State the 4-2-1 Rule for severe NPDR. What is the clinical implication?",
  "Any ONE of the three criteria = severe NPDR");
addA(3,"Diabetic Retinopathy",
  "4-2-1 Rule = ANY ONE criterion defines SEVERE NPDR:\n\n4 → Diffuse retinal haemorrhages in ALL 4 quadrants\n2 → Venous beading in ≥ 2 quadrants\n1 → IRMA (Intraretinal Microvascular Anomalies) in ≥ 1 quadrant\n\nClinical implication:\n• 50% risk of progression to PDR within 1 year\n• Requires urgent review\n• Consider early PRP (panretinal photocoagulation)\n\nNote: Severe NPDR = Preproliferative DR (PPDR) in older classification",
  "4-2-1 = Severe NPDR = 50% → PDR within 1 year. ANY ONE criterion is enough.");

addQ(4,"Diabetic Retinopathy",
  "What is PDR (Proliferative Diabetic Retinopathy)? Define NVD and NVE. What is HIGH-RISK PDR?",
  "NVD vs NVE location is a frequent exam point");
addA(4,"Diabetic Retinopathy",
  "PDR = Neovascularization of the retina\n\nNVD = New Vessels at/within 1 disc diameter of the DISC\nNVE = New Vessels ELSEWHERE in the fundus (not at disc)\n\nHigh-Risk PDR – ANY ONE of:\n• Vitreous haemorrhage OR preretinal haemorrhage\n• Any active neovascularization\n• NVD location (on/within 1 disc diameter of disc)\n• NVD > 1/3 disc area OR NVE > 1/2 disc area\n\nAdvanced DR (worst stage):\n• Tractional retinal detachment\n• Persistent vitreous haemorrhage\n• Neovascular glaucoma (NVG)",
  "NVD = at disc. NVE = elsewhere. High-risk PDR = any NVD or large NV area or VH.");

addQ(5,"Diabetic Retinopathy",
  "Diabetic patient has BOTH macular oedema AND proliferative retinopathy. What is the correct treatment sequence?",
  "PRP worsens macular oedema – sequence matters");
addA(5,"Diabetic Retinopathy",
  "Correct sequence: Treat MACULAR OEDEMA first, THEN PRP\n\nStep 1: Intravitreal ANTI-VEGF for macular oedema\n(ranibizumab / bevacizumab / aflibercept)\n\nStep 2: Panretinal Photocoagulation (PRP) for PDR\n\nWhy this order?\n• PRP burns peripheral retina → increases choroidal flow to macula\n  → can WORSEN or cause macular oedema if done first\n\nAlternative: Anti-VEGF alone for high-risk PDR\n(Protocol S: ranibizumab = PRP for 5 years)\nPrefer PRP if poor follow-up expected",
  "Macular oedema first (anti-VEGF), then PRP. PRP can worsen oedema.");

addQ(6,"Diabetic Retinopathy",
  "What is panretinal photocoagulation (PRP)? How does it work? What are the landmarks to avoid?",
  "PRP for PDR; focal/grid laser for maculopathy – don't confuse them");
addA(6,"Diabetic Retinopathy",
  "PRP (Panretinal Photocoagulation):\n• 1500-2000 burns applied to PERIPHERAL retina\n• Burns are outside the temporal macular arcades\n\nMechanism:\n• Destroys ischaemic peripheral retina\n• Reduces VEGF production → regression of neovascularization\n\nAreas SPARED during PRP:\n• Macula (temporal arcades)\n• Papillomacular bundle\n• 2 disc diameters nasal to disc (to preserve paracentral field)\n\nIn severe PDR: Treat INFERIOR fundus first\n(vitreous haemorrhage gravitates inferiorly, may obscure it later)",
  "PRP: 1500-2000 burns, peripheral retina, spares macula and 2DD nasal to disc.");

addQ(7,"Diabetic Retinopathy",
  "What is Clinically Significant Macular Oedema (CSMO)? Give the 3 defining criteria.",
  "These are the ETDRS criteria – frequently tested");
addA(7,"Diabetic Retinopathy",
  "CSMO (Clinically Significant Macular Oedema) – ANY ONE of:\n\n1. Retinal thickening within 500 μm of foveal centre\n\n2. Hard exudates within 500 μm of fovea WITH adjacent retinal thickening\n\n3. Retinal thickening ≥ 1 disc area, any portion within 1 DD of fovea\n\nTreatment:\n• Anti-VEGF (first-line): ranibizumab, bevacizumab, aflibercept\n• Intravitreal steroids (2nd line): triamcinolone, dexamethasone implant\n• OCT is the key investigation to measure retinal thickness\n\nImprovement after 3 anti-VEGF injections = strong predictor of long-term response",
  "CSMO: thickening OR hard exudates within 500μm of fovea. Treat with anti-VEGF.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 2 – HYPERTENSIVE RETINOPATHY
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 2", "Hypertensive Retinopathy – Keith-Wagener Grading");

addQ(8,"Hypertensive Retinopathy",
  "Give the Keith-Wagener-Barker (KWB) classification of hypertensive retinopathy with key features of each grade.",
  "Grade II = AV nipping. Grade IV = papilloedema. Know both.");
addA(8,"Hypertensive Retinopathy",
  "Grade I: Mild arteriolar narrowing + increased light reflex (silver/copper wire)\nGrade II: Definite narrowing + AV NIPPING (nicking) + copper/silver wire changes\nGrade III: Grade II + flame haemorrhages + cotton-wool spots + hard exudates\nGrade IV: Grade III + PAPILLOEDEMA\n\nMnemonic: '1 = narrow, 2 = nip, 3 = flame, 4 = papilloedema'\n\nCorrelation:\n• Grade I-II: Mild-moderate HTN\n• Grade III: Severe HTN\n• Grade IV: Hypertensive encephalopathy / urgency",
  "Grade II = AV nipping. Grade III = flame haem + CWS. Grade IV = papilloedema.");

addQ(9,"Hypertensive Retinopathy",
  "What is AV nipping (nicking)? Name 3 AV crossing signs in hypertensive retinopathy.",
  "Gunn's sign = generic AV nipping; specific subtypes have eponyms");
addA(9,"Hypertensive Retinopathy",
  "AV Nipping (Arteriovenous Nicking / Gunn's Sign):\n• At AV crossing: thickened arteriole compresses the underlying vein\n• Vein appears narrowed, 'nipped' on either side of artery\n• Grade II hypertensive retinopathy\n\n3 AV Crossing Signs:\n1. Salus sign: Vein deflected/bent at crossing\n2. Bonnet sign: Vein humped/arched at crossing\n3. Scheie sign: Vein tapered/banked on each side of crossing\n\nArterial changes:\n• Copper wire: early (mild increased light reflex)\n• Silver wire: advanced (severe sclerosis, vessel nearly invisible)",
  "AV nipping = Grade II HTN retinopathy. Copper → Silver = progression of arteriolar sclerosis.");

addQ(10,"Hypertensive Retinopathy",
  "What is a 'macular star' and in which conditions is it seen?",
  "Macular star ≠ only hypertension – know all causes");
addA(10,"Hypertensive Retinopathy",
  "Macular Star:\n• Hard exudates arranged in STELLATE / STAR pattern around the macula\n• Exudates deposit in Henle's fibre layer (radial arrangement around fovea)\n• Looks like a star radiating from fovea\n\nCauses (remember 'HNPC'):\n• Hypertensive retinopathy (Grade III-IV)\n• Neuroretinitis (Bartonella / cat-scratch disease)\n• Papilloedema (chronic)\n• Coats disease / other exudative conditions\n\nMnemonic: 'HNPC' = HTN / Neuroretinitis / Papilloedema / Coats",
  "Macular star = stellate hard exudates in Henle's layer. Causes: HTN, neuroretinitis, papilloedema.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 3 – RETINAL VASCULAR OCCLUSIONS
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 3", "CRAO, CRVO, BRAO & BRVO");

addQ(11,"CRAO",
  "Fundus: entire retina white/opaque, cherry-red spot at fovea, narrow arteries with boxcar segmentation. Diagnosis and emergency steps?",
  "Cherry-red spot ≠ only CRAO – know storage diseases too");
addA(11,"CRAO",
  "CENTRAL RETINAL ARTERY OCCLUSION (CRAO)\n\nPathognomonic triad:\n1. Milky-white opacification of retina (ischaemic inner retinal oedema)\n2. Cherry-red spot at fovea (choroid visible through thin fovea)\n3. Boxcar segmentation of arteries (cattle-trucking)\n\nWhy cherry-red spot?\n• Inner retinal layers are oedematous/white everywhere\n• Fovea has NO inner layers → choroidal circulation shows through → appears RED\n\nEmergency treatment (within 4.5 hours):\n• Ocular massage (dislodge embolus)\n• IV acetazolamide / topical timolol (lower IOP)\n• Inhale CO₂ + O₂ (vasodilate)\n• Intra-arterial thrombolysis\n• Urgent cardiology/neurology referral (25% stroke risk at 3 years)",
  "CRAO = cherry-red spot + white retina. Emergency. Urgent cardiovascular workup.");

addQ(12,"CRAO",
  "What are the OTHER causes of cherry-red spot at the fovea besides CRAO?",
  "Storage diseases cause cherry-red spot by a DIFFERENT mechanism");
addA(12,"CRAO",
  "Cherry-Red Spot Causes:\n\nVascular:\n• CRAO (Central Retinal Artery Occlusion)\n• Quinine toxicity\n\nStorage Diseases (sphingolipidoses):\n• Tay-Sachs disease (GM2 gangliosidosis – hexosaminidase A deficiency)\n• Niemann-Pick disease (sphingomyelinase deficiency)\n• Sandhoff disease\n• Gaucher disease (rare)\n• GM1 gangliosidosis\n\nMechanism in storage diseases:\n• Lipid accumulates in retinal ganglion cells → cells become opaque/white\n• Fovea has few/no ganglion cells → remains red\n• = same appearance as CRAO but BILATERAL and in infants",
  "Cherry-red spot: CRAO (unilateral) + storage diseases (bilateral, infants). Know Tay-Sachs.");

addQ(13,"CRAO",
  "What are Hollenhorst plaques? What do they indicate?",
  "Seen at AV bifurcations; indicate embolic disease");
addA(13,"CRAO",
  "Hollenhorst Plaques (Cholesterol Emboli):\n• Refractile, yellow-orange, glistening crystals\n• Seen at arterial bifurcations on fundoscopy\n• Represent cholesterol crystals from atheromatous plaques\n• MC source: Internal carotid artery (atheromatous plaque)\n\nTypes of Retinal Emboli:\n1. Hollenhorst (cholesterol): Yellow, refractile, at bifurcations\n2. Fibrin-platelet: Grey-white, elongated (from cardiac valves)\n3. Calcific: White, non-refractile (from cardiac valves)\n4. Septic: From bacterial endocarditis\n\nImplication: Hollenhorst plaque = carotid artery disease → risk of stroke\n→ Urgent carotid Doppler + cardiac workup",
  "Hollenhorst plaque = refractile yellow cholesterol crystal at bifurcation = carotid disease.");

addQ(14,"CRVO",
  "Classic CRVO fundus appearance. Classify into ischaemic vs non-ischaemic. What is 100-day glaucoma?",
  "'Blood and thunder fundus' = classic description of CRVO");
addA(14,"CRVO",
  "CRVO Fundus: 'BLOOD AND THUNDER'\n• Flame haemorrhages in ALL 4 quadrants (most extensive possible)\n• Dilated tortuous veins ('sausage links')\n• Disc swelling + hyperaemia\n• Cotton-wool spots + macular oedema\n\nClassification:\n| Feature          | Non-ischaemic     | Ischaemic          |\n| VA               | > 6/60            | < 6/60             |\n| RAPD             | Absent/mild       | Present            |\n| FA non-perfusion | < 10 DD           | > 10 DD            |\n| NVG risk         | Low               | HIGH               |\n\n100-Day Glaucoma (Neovascular Glaucoma):\n• Ischaemic CRVO → VEGF → rubeosis iridis (NVI) → NVA\n→ Closed-angle NVG at ~3 months (100 days)\n• Treatment: PRP + anti-VEGF + IOP lowering",
  "CRVO = blood and thunder. Ischaemic CRVO → 100-day NVG at 3 months.");

addQ(15,"BRVO",
  "Branch Retinal Vein Occlusion: MC site, MC risk factor, and treatment of macular oedema.",
  "BRVO always at AV crossing – HTN is why");
addA(15,"BRVO",
  "BRVO (Branch Retinal Vein Occlusion):\n\nMC site: SUPEROTEMPORAL quadrant (AV crossing)\nWhy? HTN → arteriosclerosis → thickened arteriole compresses vein at crossing\n\nMC risk factor: Hypertension\n\nFundus: Sector haemorrhage in one quadrant + cotton-wool spots\n• Haemorrhages fan out from AV crossing\n• Macular oedema is the main cause of vision loss\n\nVisual field: Sector/altitudinal defect in affected quadrant\n\nTreatment:\n• Macular oedema: Anti-VEGF (1st line) or intravitreal steroids\n• NVE (neovascularization): Sector laser photocoagulation\n• 50-60% maintain VA > 6/15 even without treatment",
  "BRVO: superotemporal MC site, HTN cause, anti-VEGF for macular oedema.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 4 – RETINAL DETACHMENT
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 4", "Retinal Detachment – Types, Features & Surgery");

addQ(16,"Retinal Detachment",
  "Classify retinal detachment into 3 types. State the key difference: is there a retinal BREAK present?",
  "Exudative RD = shifting fluid = NO break. TRD = concave surface = NO break.");
addA(16,"Retinal Detachment",
  "3 Types of Retinal Detachment:\n\nType           | Break? | Fluid source    | Appearance\n─────────────── | ────── | ─────────────── | ────────────────────\nRhegmatogenous | YES    | Liquefied vitreous | Corrugated, opaque, mobile\nTractional     | NO     | Local (fibrovascular) | Concave, taut, limited mobility\nExudative      | NO     | Vessels/choroid | SMOOTH, SHIFTING fluid\n\nCombined (TRD+RRD): Fibrovascular traction creates a break → both types coexist\n\nRhegmatogenous = MC type (Greek 'rhegma' = break)\nTractional = Caused by PDR, sickle cell, trauma\nExudative = Coats, VKH, choroidal tumour, posterior scleritis",
  "RRD has a BREAK. TRD = concave/taut. Exudative = smooth + shifting fluid = NO break.");

addQ(17,"Retinal Detachment",
  "Classic symptom sequence of Rhegmatogenous RD. What is Shafer's sign?",
  "Symptoms follow a specific sequence – curtain direction localizes break");
addA(17,"Retinal Detachment",
  "Classic Sequence (4 stages):\n1. FLASHES (photopsias) – vitreous traction on retina\n2. FLOATERS – vitreous syneresis; black spots/cobwebs\n3. CURTAIN/SHADOW – visual field loss from edge toward centre\n   (inferior break → shadow from below; superior break → shadow from above)\n4. CENTRAL VISUAL LOSS – when macula detaches\n\nShafer's Sign ('Tobacco Dust'):\n• Pigment cells (from RPE) floating in ANTERIOR vitreous\n• Seen on slit-lamp as golden-brown granules\n• Almost PATHOGNOMONIC of rhegmatogenous RD (or retinal break)\n\nOther signs: RAPD in extensive RD; IOP lower in affected eye (5 mmHg less)",
  "Flashes → Floaters → Curtain → VA loss. Tobacco dust (Shafer's sign) = pathognomonic of RRD.");

addQ(18,"Retinal Detachment",
  "Macula-on vs macula-off RD: urgency and visual prognosis?",
  "Macula-on is an EMERGENCY – hours matter");
addA(18,"Retinal Detachment",
  "Macula-ON RD (macula still attached):\n• Surgical EMERGENCY – operate within HOURS\n• Central vision still intact\n• Excellent prognosis if repaired before macula detaches\n\nMacula-OFF RD (macula detached):\n• Still urgent – operate within days\n• Central vision already lost\n• Visual prognosis WORSE (especially if off > 24-48 hours)\n• Photoreceptors start dying after macula detaches\n• Even after repair, full VA recovery often incomplete\n\nClinical exam: Look for macular reflex\n• Macula-on: Bright foveal reflex present\n• Macula-off: No foveal reflex; shadow extends to centre",
  "Macula-ON = hours (emergency). Macula-OFF = days (urgent but prognosis worse).");

addQ(19,"Retinal Detachment",
  "Name the 3 surgical procedures for RRD and their indications.",
  "Know which procedure for which type of break");
addA(19,"Retinal Detachment",
  "1. SCLERAL BUCKLING:\n   • External indentation of sclera → closes break\n   • Best for: peripheral breaks, phakic young patients, no PVR\n   • May induce myopia (lengthens eye)\n\n2. VITRECTOMY (PPV – Pars Plana Vitrectomy):\n   • Remove vitreous internally, drain SRF, laser/cryo break, gas/oil tamponade\n   • Best for: posterior breaks, complex RD, PVR, aphakic, VH\n\n3. PNEUMATIC RETINOPEXY:\n   • Intravitreal gas bubble + laser/cryo\n   • Best for: single SUPERIOR break, phakic, no PVR\n   • Patient must maintain head posture\n\nGas tamponades:\n• SF6: lasts ~2 weeks\n• C3F8: lasts ~8-12 weeks\n\nPVR = Proliferative Vitreoretinopathy = fibrous membranes = main cause of failure",
  "Scleral buckle (peripheral), Vitrectomy (complex/posterior), Pneumatic retinopexy (single superior break).");

addQ(20,"Retinal Detachment",
  "What is lattice degeneration? Why is it important?",
  "MC peripheral degeneration predisposing to RRD");
addA(20,"Retinal Detachment",
  "Lattice Degeneration:\n• MC clinically significant peripheral retinal degeneration\n• Oval/elongated lesion parallel to ora serrata\n• White lattice lines (sclerosed vessels) + thinned retina + pigment\n• Vitreous strongly adherent at edges → tractional tears\n\nImportance:\n• Predisposes to RHEGMATOGENOUS RD (atrophic holes + horseshoe tears)\n• Associated with HIGH MYOPIA\n• Stickler syndrome (hereditary vitreoretinopathy)\n\nTreatment:\n• Asymptomatic: Observe\n• Symptomatic (flashes/floaters) or high-risk (fellow eye RD, Stickler):\n  → Prophylactic laser photocoagulation or cryotherapy around lesion",
  "Lattice degeneration: MC peripheral degeneration → RRD. Associated with myopia.");

addQ(21,"Retinal Detachment",
  "What is PVR (Proliferative Vitreoretinopathy)? Why is it important surgically?",
  "PVR = main cause of surgical failure in RRD repair");
addA(21,"Retinal Detachment",
  "PVR (Proliferative Vitreoretinopathy):\n• Fibrous/cellular membranes on retinal surface (epiretinal)\n• Membranes CONTRACT → pucker and re-detach the retina\n• Develops after failed RD surgery or in complex primary RD\n\nStages: A → B → C1-C3 (based on extent of retinal folds)\n\nClinical features:\n• Fixed retinal folds ('starfold' pattern)\n• Reduced retinal mobility\n• Re-detachment despite previous repair\n\nTreatment:\n• Vitrectomy + membrane peeling + silicone oil tamponade\n• Very difficult to manage; multiple surgeries often needed\n\nPrevention: Minimize surgical trauma; avoid excessive cryotherapy",
  "PVR = fibrous membranes → re-detachment. MC cause of failed RD surgery. Needs vitrectomy + oil.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 5 – AMD
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 5", "Age-Related Macular Degeneration (AMD)");

addQ(22,"AMD",
  "Compare dry AMD vs wet AMD: pathology, vision loss pattern, and treatment.",
  "90% of AMD is dry; 90% of severe blindness is from wet");
addA(22,"AMD",
  "DRY AMD (Atrophic / Non-neovascular):\n• Drusen accumulation → RPE atrophy → geographic atrophy\n• Slow, gradual central vision loss\n• 90% of all AMD cases\n• Treatment: AREDS2 supplements (Vit C, Vit E, Zinc, Lutein, Zeaxanthin)\n\nWET AMD (Exudative / Neovascular):\n• Choroidal Neovascularization (CNV) → breaks through Bruch's membrane\n• Sudden severe central vision loss (metamorphopsia)\n• 10% of AMD but 90% of severe visual loss\n• Treatment: Intravitreal ANTI-VEGF (1st line)\n  – Ranibizumab (Lucentis), Bevacizumab (Avastin), Aflibercept (Eylea)\n\nKey investigation: OCT (shows subretinal fluid, CNV, RPE detachment)",
  "Dry = drusen + slow atrophy (AREDS2). Wet = CNV + sudden loss (anti-VEGF).");

addQ(23,"AMD",
  "What are drusen? Differentiate hard vs soft drusen. Which type is dangerous?",
  "Soft drusen → wet AMD. Hard drusen = benign.");
addA(23,"AMD",
  "Drusen:\n• Extracellular deposits between RPE and Bruch's membrane\n• Hallmark of AMD\n\nHard Drusen:\n• Small (< 63 μm), discrete, sharp borders\n• Yellow-white dots\n• Relatively BENIGN – low risk of progression\n\nSoft Drusen:\n• Large (≥ 125 μm), ill-defined, confluent borders\n• Higher lipid content\n• HIGH RISK for CNV (wet AMD) and geographic atrophy\n\nGiant drusen / Drusenoid RPE detachment:\n• Very large confluent soft drusen\n• Highest risk\n\nKey: Soft + confluent drusen = screen closely with Amsler grid and OCT",
  "Soft drusen = large, confluent, ill-defined = HIGH RISK for wet AMD.");

addQ(24,"AMD",
  "What is the Amsler grid test? What symptom does wet AMD cause that it detects?",
  "Metamorphopsia = wet AMD until proven otherwise");
addA(24,"AMD",
  "Amsler Grid Test:\n• A grid of horizontal and vertical lines with a central dot\n• Patient covers one eye and looks at central dot\n• Detects METAMORPHOPSIA (distortion of straight lines)\n\nIn Wet AMD:\n• CNV leaks fluid → distorts photoreceptors\n• Patient sees wavy, bent, or missing lines on Amsler grid\n• = METAMORPHOPSIA (most common presenting symptom of wet AMD)\n\nOther symptoms of wet AMD:\n• Micropsia (objects appear smaller)\n• Central scotoma\n• Sudden blurring\n\nFA appearance: Active leakage from CNV\nOCT: Subretinal fluid, CNV, pigment epithelial detachment (PED)",
  "Amsler grid detects metamorphopsia. Wavy lines = wet AMD = start anti-VEGF urgently.");

addQ(25,"AMD",
  "AREDS2 supplements: what are they and when are they indicated?",
  "Beta-carotene was replaced in AREDS2 – know what replaced it");
addA(25,"AMD",
  "AREDS2 Formula (Age-Related Eye Disease Study 2):\n• Vitamin C (500 mg)\n• Vitamin E (400 IU)\n• Zinc oxide (80 mg)\n• Cupric oxide (2 mg) – added to prevent zinc-induced copper deficiency\n• Lutein (10 mg) + Zeaxanthin (2 mg)\n  (REPLACED beta-carotene – which increased lung cancer risk in smokers)\n\nIndications:\n• Intermediate AMD (many medium drusen OR 1+ large drusen)\n• Advanced AMD in ONE eye (geographic atrophy or CNV)\n\nEffect: ~25% reduction in risk of progression to advanced AMD\n\nNOT indicated for:\n• Early AMD (small drusen only)\n• No AMD (general public)",
  "AREDS2: Vit C + Vit E + Zinc + Copper + Lutein + Zeaxanthin. Replaces beta-carotene.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 6 – RETINOBLASTOMA
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 6", "Retinoblastoma – Genetics, Presentation & Treatment");

addQ(26,"Retinoblastoma",
  "Retinoblastoma: MC intraocular tumour of childhood. Give the 3 most important genetic facts.",
  "13q14, RB1 gene, two-hit hypothesis = classic NEET PG");
addA(26,"Retinoblastoma",
  "3 Key Genetic Facts:\n\n1. Gene: RB1 gene on chromosome 13q14\n   • Tumour SUPPRESSOR gene (both alleles must be lost)\n\n2. Knudson's Two-Hit Hypothesis:\n   • Both copies (alleles) of RB1 must be inactivated\n   • Hit 1 + Hit 2 = tumour\n\n3. Bilateral vs Unilateral:\n   • BILATERAL (40%): Hit 1 = GERMLINE mutation (inherited)\n     → AD inheritance; earlier onset; multifocal\n   • UNILATERAL (60%): BOTH hits somatic (in one retinal cell)\n     → Sporadic; later onset; unifocal\n\nBilateral = ALWAYS hereditary – all bilateral patients need genetic counselling\nRisk to offspring of bilateral Rb patient: ~45% (AD with 90% penetrance)",
  "RB1 = chr 13q14. Bilateral = hereditary (germline). Two-hit hypothesis (Knudson).");

addQ(27,"Retinoblastoma",
  "What is leukocoria? Give the differential diagnosis list.",
  "Retinoblastoma is MC cause of leukocoria in < 5 year olds");
addA(27,"Retinoblastoma",
  "Leukocoria = White pupillary reflex ('cat's eye reflex')\n• MC presentation of retinoblastoma (60% of cases)\n\nDifferential Diagnosis – Mnemonic 'RCPTV':\n• Retinoblastoma (MC in < 5 yrs)\n• Coats disease (unilateral, males, subretinal exudate)\n• PHPV (Persistent Hyaloid/Hyperplastic Primary Vitreous)\n  → Unilateral, microphthalmia present\n• Toxocariasis (Toxocara canis – dog parasite)\n• Retinopathy of Prematurity (Stage 4-5)\n\nAlso: Congenital cataract, endophthalmitis, retinal dysplasia\n\nKey differentiator from Coats:\n• Retinoblastoma: CT shows CALCIFICATION (pathognomonic)\n• Coats disease: No calcification on CT",
  "Leukocoria differentials: RCPTV. CT calcification = retinoblastoma (pathognomonic).");

addQ(28,"Retinoblastoma",
  "How do you treat retinoblastoma? When is enucleation indicated?",
  "EBR is now avoided – second malignancy risk in RB1 germline");
addA(28,"Retinoblastoma",
  "Treatment (IIRC Group-based):\n\nGroup A (small < 3mm): Focal therapy (laser, cryo)\nGroup B (larger, no seeding): Chemoreduction (ChRC) + focal\nGroup C-D (vitreous seeding): Chemoreduction + focal + salvage\nGroup E (extensive disease): ENUCLEATION\n\nChemoreduction (VCE): Vincristine + Carboplatin + Etoposide\n\nFocal: Laser photocoagulation, cryotherapy, plaque brachytherapy\n\nEnucleation = for unilateral Group E (advanced, NVG, phthisis)\nIn bilateral: Enucleate worse eye, save better eye\n\nAVOID External Beam Radiotherapy (EBR):\n→ RB1 germline mutation carriers have high risk of\n  second malignancies (especially OSTEOSARCOMA)\n→ EBR increases this risk substantially",
  "Group E = enucleation. Avoid EBR in bilateral (hereditary) cases – osteosarcoma risk.");

addQ(29,"Retinoblastoma",
  "What is trilateral retinoblastoma? What is its prognosis?",
  "Third 'eye' = pineal gland in trilateral Rb");
addA(29,"Retinoblastoma",
  "Trilateral Retinoblastoma:\n• Bilateral retinoblastoma + PINEAL GLAND tumour\n• (sometimes suprasellar/parasellar PNET)\n• The pineal gland is called the 'third eye' (hence trilateral)\n\nPathogenesis:\n• Pinealoblastoma arises from same embryological precursors as retinoblasts\n• Occurs in patients with hereditary (germline) RB1 mutations\n• Usually develops 20-36 months after ocular diagnosis\n\nIncidence: ~5% of hereditary retinoblastoma cases\n\nPrognosis: VERY POOR\n• Usually fatal\n• Median survival < 9 months\n• May improve with aggressive chemotherapy + radiation\n\nScreening: Brain MRI every 6 months in hereditary Rb",
  "Trilateral Rb = bilateral Rb + pineal PNET. Poor prognosis. Screen hereditary Rb with brain MRI.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 7 – ROP, RP, CSR, COATS
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 7", "ROP, Retinitis Pigmentosa, CSR & Coats Disease");

addQ(30,"ROP",
  "Retinopathy of Prematurity: risk factors, zones, and when to treat?",
  "Zone I = worst. Anti-VEGF now preferred for Zone I ROP.");
addA(30,"ROP",
  "ROP Risk Factors:\n• Prematurity (< 28-32 weeks gestation)\n• Low birth weight (< 1500g)\n• Excess supplemental OXYGEN (key trigger)\n\nMechanism: O₂ → suppresses VEGF → vessel arrest → ischaemia → VEGF surge → NV\n\nZones (I = posterior, III = peripheral):\n• Zone I: Around disc (2× disc-fovea distance radius) – WORST prognosis\n• Zone II: Beyond Zone I to equator\n• Zone III: Peripheral crescent\n\nStages: 1 (demarcation line) → 2 (ridge) → 3 (extraretinal NV) → 4 (partial RD) → 5 (total RD)\n\nTreatment threshold (Type 1 = TREAT):\n• Zone I: Any stage + plus disease, OR Stage 3\n• Zone II: Stage 2-3 + plus disease\n\nTreatment:\n• Laser (standard for Zone II-III)\n• Intravitreal bevacizumab (preferred Zone I)\n\nPlus disease = dilated tortuous posterior vessels = aggressive active ROP",
  "ROP: prematurity + O₂. Zone I worst. Type 1 = treat (laser/anti-VEGF). Plus = urgent.");

addQ(31,"Retinitis Pigmentosa",
  "Retinitis Pigmentosa: classic triad on fundoscopy, first symptom, and syndromic associations.",
  "Night blindness is ALWAYS the first symptom");
addA(31,"Retinitis Pigmentosa",
  "Retinitis Pigmentosa (RP):\n\nFirst symptom: NIGHT BLINDNESS (nyctalopia) – rods affected first\n\nFundoscopic Triad:\n1. Bone spicule pigmentation (peripheral retina)\n2. Attenuated retinal vessels (arteriolar narrowing)\n3. Waxy disc pallor (optic disc)\n\nVisual field: Ring scotoma → tunnel vision → central loss\nERG: Reduced or extinguished (rods > cones initially)\nInheritance: AD (MC), AR, X-linked (most severe)\n\nSyndromic Associations:\n• Usher syndrome: RP + sensorineural DEAFNESS (AR)\n• Laurence-Moon-Biedl: RP + obesity + polydactyly + hypogonadism + learning difficulties\n• Kearns-Sayre syndrome: RP + ophthalmoplegia + cardiac block (mitochondrial)\n• Refsum disease: RP + ataxia + polyneuropathy (phytanic acid accumulation)",
  "RP triad: bone spicules + attenuated vessels + waxy disc. Night blindness FIRST. Usher = RP + deafness.");

addQ(32,"CSR",
  "Central Serous Chorioretinopathy (CSR): typical patient, FA finding, and triggers.",
  "'Smokestack' or 'inkblot' FA pattern = CSR");
addA(32,"CSR",
  "CSR (Central Serous Chorioretinopathy):\n\nTypical patient: Young/middle-aged MALE, type-A personality, stressed\n\nPathology: Focal RPE break → serous fluid under neurosensory retina\n(no blood, no lipid – pure serous fluid)\n\nSymptoms: Unilateral blurred vision, micropsia, metamorphopsia, central scotoma\n\nFundus: Dome-shaped neurosensory retinal detachment\nOCT: Subretinal fluid + RPE detachment\n\nFA (Fluorescein Angiography):\n• Smokestack pattern: Leak ascends then spreads like smoke\n• Inkblot pattern: Slow radial enlargement from a focal point\n\nTriggers/Associations: CORTICOSTEROIDS (MC iatrogenic cause), stress, Cushing's, pregnancy\n\nCourse: Usually self-limiting → resolves in 3 months\nTreatment: Observe; stop steroids; PDT for chronic/recurrent; focal laser if leak far from fovea",
  "CSR: young stressed male + smokestack FA + steroid association. Usually resolves in 3 months.");

addQ(33,"Coats Disease",
  "Coats disease: who gets it, what does it look like, and HOW do you differentiate from retinoblastoma?",
  "CT scan is the KEY differentiator from retinoblastoma");
addA(33,"Coats Disease",
  "Coats Disease:\n• Young males, unilateral, NON-hereditary\n• Retinal telangiectasia + massive subretinal exudation\n• Cholesterol crystals in subretinal space\n\nPresentation:\n• Leukocoria (like Rb)\n• Strabismus\n• May have retinal detachment (exudative)\n\nDifferentiation from Retinoblastoma:\n\nFeature         | Coats Disease    | Retinoblastoma\n─────────────── | ──────────────── | ──────────────────\nAge/sex         | Young males      | Both sexes, < 5 yr\nCalcification   | ABSENT on CT     | PRESENT on CT\nHereditary      | No               | AD (bilateral)\nBilateral       | Rare             | 40%\nRetinal tissue  | No mass          | Solid intraocular mass\n\nTreatment: Laser/cryo to telangiectatic vessels; anti-VEGF; vitrectomy for RD",
  "Coats vs Rb: CT calcification = Rb. No calcification = Coats. Key differentiator.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 8 – PVD & VITREOUS
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 8", "PVD, Vitreous Haemorrhage & Macular Disorders");

addQ(34,"PVD",
  "What is PVD? What is the Weiss ring? Why is PVD clinically important?",
  "PVD itself is benign but can cause retinal tears");
addA(34,"PVD",
  "PVD (Posterior Vitreous Detachment):\n• Age-related separation of vitreous cortex from retina\n• Synchysis (liquefaction) → syneresis (condensation) → detachment\n\nEpidemiology:\n• < 10% under age 50; > 66% over age 70\n• Also: myopia, cataract surgery, trauma, uveitis\n\nWeiss Ring:\n• Ring-shaped floater = ring of glial tissue (from around optic disc)\n• Pathognomonic of posterior vitreous detachment\n\nSymptoms: Flashes (traction) + floaters (condensates)\n\nClinical importance:\n• Usually benign and self-limiting\n• Can cause horseshoe (U-shaped) tears at sites of vitreoretinal adhesion\n• Tears → RRD if untreated\n• → EXAMINE PERIPHERY for tears after PVD\n• Treat symptomatic tears prophylactically with laser/cryo",
  "PVD: Weiss ring = pathognomonic floater. Always examine periphery for tears.");

addQ(35,"Macular Disorders",
  "What is the Amsler grid used for and what does each abnormality suggest?",
  "Every patient with metamorphopsia needs urgent OCT");
addA(35,"Macular Disorders",
  "Amsler Grid – Tests CENTRAL 10 degrees of visual field\n\nMethod: One eye covered, look at central dot from 30 cm\n\nAbnormalities and their causes:\n\nMissing squares / scotoma:\n→ Geographic atrophy (dry AMD), macular hole, CSR\n\nWavy/distorted lines (metamorphopsia):\n→ Wet AMD (CNV), CSR, epiretinal membrane (ERM)\n\nBlurred central area:\n→ Macular oedema (diabetic, BRVO, wet AMD)\n\nKey conditions causing metamorphopsia:\n1. Wet AMD – subretinal fluid/CNV\n2. CSR – subretinal fluid\n3. Epiretinal membrane (ERM) – surface contraction\n4. Macular hole (stage 1-2)\n\nInvestigate all metamorphopsia with OCT urgently",
  "Amsler grid: metamorphopsia = wet AMD/CSR/ERM. Scotoma = hole/atrophy. Urgent OCT.");

addQ(36,"Macular Disorders",
  "Macular hole: stages, clinical features, and treatment.",
  "Optical coherence tomography (OCT) is gold standard for diagnosis");
addA(36,"Macular Disorders",
  "Macular Hole (Full-thickness defect at fovea):\n\nStages (Gass classification):\n• Stage 1: Foveal detachment (impending hole) – Watzke-Allen test may be negative\n• Stage 2: Small full-thickness hole (< 400 μm) – central scotoma begins\n• Stage 3: Full-thickness hole > 400 μm – cuff of subretinal fluid, no vitreous detachment\n• Stage 4: Full-thickness hole + complete PVD\n\nSymptoms: Central scotoma + metamorphopsia\nWatzke-Allen test: Beam appears broken when projected across hole\nOCT: Definitive diagnosis (shows full-thickness defect)\n\nRisk factors: Female, > 50 years, hyperopia, trauma\n\nTreatment:\n• Stage 1: Observe (may close spontaneously)\n• Stage 2-4: VITRECTOMY + ILM (internal limiting membrane) peeling + gas tamponade + face-down posturing",
  "Macular hole: OCT = gold standard. Stage 2-4 = vitrectomy + ILM peel + gas.");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 9 – PYQ CLINICAL SCENARIOS
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 9", "Rapid-Fire PYQ Clinical Scenarios");

addQ(37,"PYQ Scenario",
  "Type 2 DM patient on fundoscopy: NVD > 1/3 disc area + vitreous haemorrhage. What stage? Treatment?",
  "High-risk PDR criteria – all 4 conditions must be known");
addA(37,"PYQ Scenario",
  "HIGH-RISK PDR (Proliferative Diabetic Retinopathy)\n\nCriteria met:\n• NVD > 1/3 disc area ✓\n• Vitreous haemorrhage ✓ (any one criterion = high risk)\n\nTreatment:\n1. Panretinal Photocoagulation (PRP) – urgently\n   1500-2000 burns to peripheral retina (outside arcades)\n\n2. If macular oedema coexists: anti-VEGF FIRST, then PRP\n\n3. Anti-VEGF (ranibizumab) as alternative to PRP\n   (Protocol S = equal efficacy at 5 years)\n\n4. For vitreous haemorrhage not clearing: VITRECTOMY\n\nSystemic control: Optimize HbA1c, BP, lipids\nReferral: Urgent diabetic eye review",
  "High-risk PDR: PRP urgently. If macular oedema + PDR: treat oedema (anti-VEGF) FIRST.");

addQ(38,"PYQ Scenario",
  "55-year-old hypertensive. Fundus: flame haemorrhages in ALL 4 quadrants, disc swelling, dilated tortuous veins. Diagnosis and 3-month risk?",
  "100-day glaucoma is the feared complication");
addA(38,"PYQ Scenario",
  "CENTRAL RETINAL VEIN OCCLUSION (CRVO)\n\nFundus: 'Blood and thunder'\n• Flame haemorrhages in all 4 quadrants\n• Dilated tortuous veins\n• Disc swelling + hyperaemia\n\n3-month risk: NEOVASCULAR GLAUCOMA (NVG)\n= '100-day glaucoma'\n• Ischaemic retina → VEGF → rubeosis iridis (NVI) → NVA\n→ Closed-angle NVG\n\nManagement:\n1. FA: Classify as ischaemic (> 10 DD non-perfusion) or non-ischaemic\n2. If ischaemic: PRP + monthly anti-VEGF + watch for NVI\n3. Macular oedema: Anti-VEGF (ranibizumab, bevacizumab)\n4. If NVI develops: Immediate PRP + anti-VEGF + IOP control\n\nRisk factors: HTN (MC), DM, open-angle glaucoma, hyperviscosity",
  "CRVO = blood and thunder. Ischaemic CRVO → NVG (100-day glaucoma) at 3 months.");

addQ(39,"PYQ Scenario",
  "Young myopic man, flashes then floaters, curtain shadow from below. Fundus: grey corrugated elevated retina with tobacco dust in vitreous. Diagnosis and urgency?",
  "Inferior shadow = superior break; superior shadow = inferior break");
addA(39,"PYQ Scenario",
  "RHEGMATOGENOUS RETINAL DETACHMENT (RRD)\n\nDiagnosis confirmed by:\n• Young myope (risk factor)\n• Flashes → floaters → curtain (classic sequence)\n• Tobacco dust (Shafer's sign) = pigment cells in vitreous = pathognomonic\n• Grey corrugated elevated retina (inner retinal oedema)\n• Inferior shadow → SUPERIOR break (SRF flows down from superior break)\n\nUrgency: URGENT (hours if macula-on; days if macula-off)\n\nAssess: Is macula attached? → determines urgency\n\nTreatment:\n• Locate all breaks (indirect ophthalmoscopy + scleral indentation)\n• Scleral buckling (peripheral breaks) OR vitrectomy (posterior/complex)\n• Cryotherapy / laser around breaks\n\nDO NOT miss fellow eye examination (bilateral risk in lattice degeneration)",
  "Tobacco dust (Shafer's sign) = RRD. Inferior shadow = superior break. Urgent surgery.");

addQ(40,"PYQ Scenario",
  "Child, 3 years old, white pupillary reflex noticed by parents. CT shows calcification in the globe. Diagnosis, gene, and management?",
  "CT calcification = retinoblastoma. No calcification = Coats");
addA(40,"PYQ Scenario",
  "RETINOBLASTOMA\n\nKey features:\n• Child < 5 years\n• Leukocoria (MC presentation)\n• CT calcification = PATHOGNOMONIC of retinoblastoma\n\nGene: RB1 (chromosome 13q14)\n\nManagement pathway:\n1. Ophthalmology examination under anaesthesia (EUA) to stage\n2. MRI orbit + brain (check optic nerve extension + brain mets)\n3. Systemic staging (bone marrow, CSF if extraocular suspected)\n4. Genetic testing (germline vs somatic)\n\nTreatment:\n• Group A-B: Focal therapy ± chemoreduction\n• Group C-D: Chemoreduction (VCE) + focal\n• Group E or extensive: ENUCLEATION\n\nFamily screening: All siblings and offspring (bilateral/hereditary cases)\nAvoid EBR in hereditary (osteosarcoma risk from RB1 mutation)",
  "Leukocoria + CT calcification = retinoblastoma. RB1 gene 13q14. Group E = enucleation.");

addQ(41,"PYQ Scenario",
  "Elderly patient: gradual central vision loss, drusen on fundoscopy, suddenly develops metamorphopsia and straight lines appear wavy. Next step and treatment?",
  "Sudden metamorphopsia in AMD = wet conversion = emergency");
addA(41,"PYQ Scenario",
  "AMD CONVERSION TO WET (Exudative AMD)\n\nBackground: Dry AMD (drusen) → NEW symptom of metamorphopsia = CNV developing\n\nNext Step: URGENT OCT + FA\n• OCT: Will show subretinal fluid, PED, CNV\n• FA: Active leakage from CNV membrane\n\nAmsler grid: Patient reports wavy/distorted lines\n\nTreatment: Intravitreal ANTI-VEGF\n• Ranibizumab (Lucentis) – 0.5 mg\n• Bevacizumab (Avastin) – off-label\n• Aflibercept (Eylea) – less frequent dosing\n• Monthly × 3 loading doses, then PRN or treat-and-extend\n\nGoal: Dry out subretinal fluid, stabilize vision\n→ 90% stabilize; 30-40% improve ≥ 3 lines ETDRS\n\nReferral: Same-day urgent ophthalmology if sudden metamorphopsia in known AMD",
  "Sudden metamorphopsia in dry AMD = wet conversion. Urgent OCT → anti-VEGF.");

addQ(42,"PYQ Scenario",
  "Grade 4 hypertensive retinopathy on fundoscopy. What is the systemic emergency and immediate management?",
  "Grade IV = hypertensive encephalopathy – ocular findings guide diagnosis");
addA(42,"PYQ Scenario",
  "HYPERTENSIVE CRISIS / HYPERTENSIVE ENCEPHALOPATHY\n\nGrade IV retinopathy:\n• Flame haemorrhages + cotton-wool spots + hard exudates\n• PAPILLOEDEMA (the defining feature of Grade IV)\n\nSystemic emergency:\n• BP typically > 180/120 mmHg\n• End-organ damage: brain, kidney, heart\n• Features: headache, visual blurring, confusion, nausea\n\nImmediate management:\n• Admit to ICU/HDU\n• IV labetalol or IV sodium nitroprusside\n• Target: Reduce MAP by 20-25% in first hour (NOT normalise rapidly)\n• Rapid reduction → cerebral ischaemia / watershed infarction\n\nOphthalmology:\n• Grade IV = papilloedema = must treat underlying HTN\n• Visual loss from macular oedema, optic nerve ischaemia\n• Monitor vision and fundus as HTN is treated",
  "Grade IV HTN retinopathy = hypertensive emergency. Reduce MAP by 25% in 1 hour (not fully).");

// ═══════════════════════════════════════════════════════════════════════
// SECTION 10 – ONE-LINERS & MNEMONICS
// ═══════════════════════════════════════════════════════════════════════
addSection("SECTION 10", "One-Liners, Mnemonics & Final Rapid Review");

addQ(43,"One-Liner",
  "What is the hallmark of PREPROLIFERATIVE DR? Which sign indicates most severe ischaemia?",
  "");
addA(43,"One-Liner",
  "Preproliferative (Severe NPDR):\n• Cotton-wool spots + venous beading + IRMA\n• 4-2-1 rule (any 1 = severe NPDR)\n\nMost severe ischaemia sign:\n• IRMA (Intraretinal Microvascular Anomalies)\n  → Blood vessel remodelling WITHIN retina\n  → Precursor to neovascularization (NVD/NVE)\n  → = Florid preproliferative change\n\nVenous beading = irregular calibre ('sausage link' appearance)\n= Second most ominous sign of ischaemia\n\nKey distinction:\n• IRMA = INTRAretinal vessels (no leakage on FA)\n• NVE = EXTRAretinal vessels (leak profusely on FA, cross vessels)",
  "IRMA = worst ischaemia sign in NPDR. IRMA is intraretinal; NVE is extraretinal (leaks on FA).");

addQ(44,"One-Liner",
  "What gas is used in vitreoretinal surgery as tamponade? What must patients avoid?",
  "Flying = absolute contraindication with intraocular gas");
addA(44,"One-Liner",
  "Intraocular Gas Tamponades:\n\nSF6 (sulphur hexafluoride):\n• Lasts approximately 2 weeks\n• For macular holes, small RD\n\nC3F8 (perfluoropropane):\n• Lasts approximately 8-12 weeks\n• For complex RD, larger tears\n\nSilicone oil:\n• Permanent (removed later)\n• For complex RD, PVR, Giant retinal tear\n\nPatient MUST AVOID:\n• AIR TRAVEL (gas expands at altitude → acute glaucoma)\n• NITROUS OXIDE anaesthesia (N₂O diffuses into gas bubble → expansion)\n• High altitude activities (skiing, climbing)\n\nAbsolute contraindication: Flying until gas absorbed\nInform all anaesthetists: 'Intraocular gas present – no N₂O'",
  "Gas tamponade: SF6 (2 weeks), C3F8 (8-12 weeks). No flying, no N₂O anaesthesia.");

addQ(45,"One-Liner",
  "State the key features that differentiate RRD from exudative RD on clinical examination.",
  "Shifting fluid is the pathognomonic sign of exudative RD");
addA(45,"One-Liner",
  "RRD vs Exudative RD:\n\nFeature            | RRD                    | Exudative RD\n─────────────────── | ─────────────────────── | ────────────────────\nRetinal break       | YES (visible)           | NO\nAppearance         | Corrugated, opaque      | Smooth, bullous\nFluid               | Fixed (no gravity shift)| SHIFTING (gravity-dependent)\nVitreous            | Tobacco dust, pigment   | Clear\nIOP                 | Lower than fellow eye   | Normal/raised\nSymptoms            | Flashes + floaters       | Painless vision loss\nCauses              | Myopia, PVD, lattice    | Coats, VKH, tumour, posterior scleritis\n\nKey test: Head position change (tilt head) → fluid moves = EXUDATIVE",
  "Exudative RD = smooth + shifting fluid + no break + clear vitreous. Position test = fluid shifts.");

addQ(46,"One-Liner",
  "Name 5 causes of vitreous haemorrhage.",
  "PDR is the MC cause in adults");
addA(46,"One-Liner",
  "Vitreous Haemorrhage – Causes (Mnemonic 'PDTSR'):\n\n1. PDR (Proliferative Diabetic Retinopathy) – MC in adults\n   → NVD/NVE bleeds into vitreous\n\n2. PVD (Posterior Vitreous Detachment) with retinal tear\n   → Tear severs retinal vessel\n\n3. Trauma\n   → Direct or indirect ocular trauma\n\n4. Sickle cell retinopathy\n   → Sea fan neovascularization bleeds\n\n5. Retinal vein occlusion (CRVO/BRVO)\n   → NV from ischaemia bleeds\n\nAlso: Terson syndrome (VH + subarachnoid haemorrhage), wet AMD\n\nBlack fundus view → use B-scan ultrasound to detect underlying RD\nKey: ALWAYS do US to exclude associated retinal detachment",
  "VH causes: PDR (MC), PVD with tear, trauma, sickle cell, RVO. US to exclude RD.");

addQ(47,"One-Liner",
  "Terson syndrome: what is it and why is it important to know?",
  "A systemic emergency presenting with ocular finding");
addA(47,"One-Liner",
  "Terson Syndrome:\n• Vitreous haemorrhage (or intraretinal/subhyaloid haemorrhage)\n  occurring in association with SUBARACHNOID HAEMORRHAGE (SAH)\n\nMechanism:\n• Sudden raised ICP → elevated central venous pressure\n→ Rupture of retinal vessels through internal limiting membrane\n→ Blood enters vitreous\n\nOccurs in ~20% of SAH patients\nBilateral in ~50% of Terson syndrome cases\n\nImportance:\n• Any patient with unexplained bilateral vitreous haemorrhage\n  → Consider SAH → urgent CT head\n• Patients with severe SAH + Terson syndrome have worse prognosis\n• VH usually clears spontaneously; vitrectomy if persistent\n\nAssociation: Also seen with severe intracranial hypertension, subdural haematoma",
  "Terson syndrome = VH + SAH. Any bilateral VH → rule out intracranial haemorrhage.");

addQ(48,"One-Liner",
  "Summarise the anti-VEGF agents used in ophthalmology – drug names, type, and conditions treated.",
  "Know all 4 agents and their approvals");
addA(48,"One-Liner",
  "Anti-VEGF Agents in Ophthalmology:\n\nDrug              | Type                    | Uses\n───────────────── | ─────────────────────── | ────────────────────────\nRanibizumab       | Anti-VEGF Fab fragment   | Wet AMD, DME, CRVO, BRVO, ROP\n(Lucentis)        | (humanized)             |\nBevacizumab       | Full anti-VEGF antibody  | Wet AMD (off-label), DME,\n(Avastin)         | (off-label in eye)      | PDR, ROP (off-label)\nAflibercept       | VEGF trap (decoy receptor)| Wet AMD, DME, CRVO, BRVO\n(Eylea)           | Longer duration          | Every 8-12 weeks dosing\nBrolucizumab      | Anti-VEGF scFv fragment | Wet AMD (newest, less frequent)\n(Beovu)           | Smallest molecule        |\n\nRoute: ALL given by INTRAVITREAL INJECTION\nFrequency: Monthly × 3 loading, then PRN or treat-and-extend",
  "Anti-VEGF: Ranibizumab, Bevacizumab (off-label), Aflibercept, Brolucizumab. All intravitreal.");

addQ(49,"Mnemonics",
  "Give key mnemonics for: (1) causes of leukocoria, (2) KWB grading, (3) RD types, (4) 4-2-1 rule.",
  "These appear repeatedly in PYQ explanations");
addA(49,"Mnemonics",
  "1. Leukocoria differentials – 'RCPTV':\n   Retinoblastoma / Coats / PHPV / Toxocara / Vitreous (ROP)\n\n2. KWB grading – '1 narrow 2 nip 3 flame 4 papilloedema':\n   Grade 1: Narrow arterioles\n   Grade 2: Nip (AV nipping)\n   Grade 3: flame haem + CWS\n   Grade 4: Papilloedema\n\n3. RD types – 'Rheg Tracts Exit':\n   Rhegmatogenous (break) / Tractional (no break, concave) / Exudative (shifting)\n\n4. 4-2-1 Rule:\n   4 quadrants haemorrhage\n   2 quadrants venous beading\n   1 quadrant IRMA\n   = ANY ONE = Severe NPDR",
  "RCPTV | '1 narrow 2 nip 3 flame 4 papilloedema' | Rheg Tracts Exit | 4-2-1");

addQ(50,"Final Summary",
  "FINAL CARD: Top 15 must-know one-liners for NEET PG 2026 Retina",
  "These cover > 80% of retina PYQs");
addA(50,"Final Summary",
  "Top 15 Retina One-Liners:\n1. Microaneurysms = FIRST sign of DR\n2. Cotton-wool spots = ischaemia; hard exudates = lipid leakage\n3. 4-2-1 = severe NPDR = 50% → PDR in 1 year\n4. In PDR + macular oedema: anti-VEGF FIRST, then PRP\n5. PRP: 1500-2000 burns, outside arcades, spare macula\n6. CRAO = cherry-red spot + white retina = ophthalmic emergency\n7. Cherry-red spot in infant = Tay-Sachs (storage disease)\n8. CRVO = blood and thunder; ischaemic → NVG (100-day glaucoma)\n9. BRVO: superotemporal MC site; anti-VEGF for macular oedema\n10. Tobacco dust (Shafer's sign) = RRD pathognomonic\n11. RRD = corrugated; TRD = concave; Exudative = shifting fluid\n12. Leukocoria + CT calcification = retinoblastoma (NOT Coats)\n13. Bilateral Rb = hereditary; RB1 gene 13q14; avoid EBR\n14. KWB Grade IV = papilloedema = hypertensive emergency\n15. Wet AMD = metamorphopsia = urgent anti-VEGF; Amsler grid",
  "Revise these 15 daily for 1 week before NEET PG 2026!");

// ── Write file ────────────────────────────────────────────────────────────────
pres.writeFile({ fileName: "/home/daytona/workspace/retina-flashcards/Retina_Flashcards_NEETPG2026.pptx" })
  .then(() => console.log("SUCCESS: Retina PPTX created."))
  .catch(e => console.error("ERROR:", e));

Running Command

cd /home/daytona/workspace/retina-flashcards && node retina_flashcards.js

Running Command

ls -lh /home/daytona/workspace/retina-flashcards/

Your Retina flashcard deck is ready! 🎉

Retina Flashcards NEETPG2026

Presentation · PPTX

What's inside (1.4 MB, 110 slides)

Same navy-question / teal-answer design as the neuro-ophtho deck, with the accent colour changed to red to match the "retina" theme.

Section	Cards	Topics Covered
1	7	Diabetic Retinopathy - classification, 4-2-1, CSMO, PRP, anti-VEGF
2	3	Hypertensive retinopathy - KWB grading, AV nipping, macular star
3	5	CRAO, CRVO, BRVO - cherry-red spot, blood & thunder, 100-day glaucoma
4	6	Retinal detachment - types, Shafer's sign, macula-on/off, surgery, PVR
5	4	AMD - dry vs wet, drusen, Amsler grid, AREDS2 supplements
6	4	Retinoblastoma - RB1 gene, two-hit, leukocoria DDx, treatment, trilateral
7	4	ROP, Retinitis pigmentosa, CSR (smokestack), Coats disease
8	3	PVD, Weiss ring, macular hole (Gass staging)
9	6	Full PYQ clinical scenarios - solved with reasoning
10	8	Anti-VEGF agents, gas tamponades, Terson syndrome, mnemonics, final 15 one-liners

Tip: Go through this right after reviewing the teaching notes above - the scenarios in Section 9 directly test the concepts from the notes.

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