RGUHS neuro-ophthalmology exam questions RS Singi Yatiraj ophthalmology

RGUHS ophthalmology neuro-ophthalmology questions "visual pathway" "pupil" "nystagmus" "optic neuritis" last 5 years

mkdir -p /home/daytona/workspace/neuro-ophthalmology && ls /home/daytona/workspace/neuro-ophthalmology/

mkdir -p /home/daytona/workspace/neuro-ophthalmology && python3 << 'PYEOF' from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.units import mm, cm from reportlab.lib.colors import HexColor, white, black from reportlab.platypus import (SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, PageBreak, HRFlowable, KeepTogether) from reportlab.lib.enums import TA_LEFT, TA_CENTER, TA_JUSTIFY from reportlab.platypus import BaseDocTemplate, Frame, PageTemplate from reportlab.lib import colors # ── Color palette ────────────────────────────────────────────────── NAVY = HexColor('#0D2E5A') TEAL = HexColor('#0077B6') LTBLUE = HexColor('#90E0EF') ACCENT = HexColor('#E63946') GOLD = HexColor('#F4A261') LGRAY = HexColor('#F1F4F8') MGRAY = HexColor('#C8D6E5') DKGRAY = HexColor('#2D3436') GREEN = HexColor('#2D6A4F') LTGREEN = HexColor('#D8F3DC') ORANGE = HexColor('#FB8500') LTORANGE= HexColor('#FFF3E0') W, H = A4 # ── Document setup ────────────────────────────────────────────────── doc = SimpleDocTemplate( '/home/daytona/workspace/neuro-ophthalmology/Neuro_Ophthalmology_RGUHS_Notes.pdf', pagesize=A4, leftMargin=18*mm, rightMargin=18*mm, topMargin=22*mm, bottomMargin=22*mm ) styles = getSampleStyleSheet() # ── Custom styles ─────────────────────────────────────────────────── def S(name, **kw): return ParagraphStyle(name, **kw) cover_title = S('CoverTitle', fontSize=28, textColor=white, fontName='Helvetica-Bold', alignment=TA_CENTER, leading=34) cover_sub = S('CoverSub', fontSize=14, textColor=LTBLUE, fontName='Helvetica-Bold', alignment=TA_CENTER, leading=20) cover_info = S('CoverInfo', fontSize=11, textColor=LGRAY, fontName='Helvetica', alignment=TA_CENTER, leading=16) ch_title = S('ChTitle', fontSize=16, textColor=white, fontName='Helvetica-Bold', alignment=TA_LEFT, spaceBefore=4, spaceAfter=4, leading=20) h1 = S('H1', fontSize=13, textColor=NAVY, fontName='Helvetica-Bold', spaceBefore=10, spaceAfter=4, leading=16) h2 = S('H2', fontSize=11, textColor=TEAL, fontName='Helvetica-Bold', spaceBefore=8, spaceAfter=3, leading=14) h3 = S('H3', fontSize=10, textColor=GREEN, fontName='Helvetica-Bold', spaceBefore=6, spaceAfter=2, leading=13) body = S('Body', fontSize=9, fontName='Helvetica', leading=13, textColor=DKGRAY, spaceBefore=2, spaceAfter=2, alignment=TA_JUSTIFY) bullet = S('Bullet', fontSize=9, fontName='Helvetica', leading=13, textColor=DKGRAY, leftIndent=14, firstLineIndent=-7, spaceBefore=1, spaceAfter=1) bullet2 = S('Bullet2', fontSize=8.5, fontName='Helvetica', leading=12, textColor=DKGRAY, leftIndent=26, firstLineIndent=-8, spaceBefore=1, spaceAfter=1) exam_q = S('ExamQ', fontSize=9, fontName='Helvetica-Bold', textColor=ACCENT, leading=13, spaceBefore=3, spaceAfter=1) tip = S('Tip', fontSize=8.5, fontName='Helvetica-Oblique', textColor=GREEN, leading=12, leftIndent=8, spaceBefore=2, spaceAfter=2) mnemonic = S('Mnemonic', fontSize=9, fontName='Helvetica-Bold', textColor=ORANGE, leading=13, leftIndent=8) # ── Helper builders ───────────────────────────────────────────────── def chapter_banner(text, color=NAVY): data = [[Paragraph(text, ch_title)]] t = Table(data, colWidths=[174*mm]) t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), color), ('TOPPADDING', (0,0), (-1,-1), 8), ('BOTTOMPADDING',(0,0), (-1,-1), 8), ('LEFTPADDING', (0,0), (-1,-1), 12), ('ROUNDEDCORNERS', [4]), ])) return t def section_box(heading, items, bg=LGRAY, border=TEAL): rows = [[Paragraph(heading, h2)]] for item in items: rows.append([Paragraph(item, bullet)]) t = Table(rows, colWidths=[174*mm]) t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (0,0), MGRAY), ('BACKGROUND', (0,1), (-1,-1), bg), ('BOX', (0,0), (-1,-1), 1.2, border), ('LINEBELOW', (0,0), (0,0), 1, border), ('TOPPADDING', (0,0), (-1,-1), 5), ('BOTTOMPADDING',(0,0), (-1,-1), 4), ('LEFTPADDING', (0,0), (-1,-1), 10), ])) return t def exam_box(questions): rows = [[Paragraph('★ RGUHS / RS SINGI YATIRAJ — EXAM QUESTIONS', S('EBH', fontSize=9, fontName='Helvetica-Bold', textColor=white))]] for q in questions: rows.append([Paragraph(q, S('EBI', fontSize=8.5, fontName='Helvetica', textColor=DKGRAY, leading=12, leftIndent=6))]) t = Table(rows, colWidths=[174*mm]) t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (0,0), ACCENT), ('BACKGROUND', (0,1), (-1,-1), HexColor('#FFF5F5')), ('BOX', (0,0), (-1,-1), 1.2, ACCENT), ('LINEBELOW', (0,0), (0,0), 1, ACCENT), ('TOPPADDING', (0,0), (-1,-1), 5), ('BOTTOMPADDING',(0,0), (-1,-1), 4), ('LEFTPADDING', (0,0), (-1,-1), 10), ])) return t def mnemonic_box(label, text): data = [[Paragraph(f'<b>MNEMONIC — {label}:</b> {text}', S('MBox', fontSize=9, fontName='Helvetica', textColor=HexColor('#6B3800'), leading=13))]] t = Table(data, colWidths=[174*mm]) t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), LTORANGE), ('BOX', (0,0), (-1,-1), 1.2, ORANGE), ('TOPPADDING', (0,0), (-1,-1), 6), ('BOTTOMPADDING',(0,0),(-1,-1), 6), ('LEFTPADDING', (0,0), (-1,-1), 10), ])) return t def tip_box(text): data = [[Paragraph(f'<b>💡 TIP:</b> {text}', S('TipB', fontSize=8.5, fontName='Helvetica', textColor=HexColor('#1B4332'), leading=12))]] t = Table(data, colWidths=[174*mm]) t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), LTGREEN), ('BOX', (0,0), (-1,-1), 1, GREEN), ('TOPPADDING', (0,0), (-1,-1), 5), ('BOTTOMPADDING',(0,0),(-1,-1), 5), ('LEFTPADDING', (0,0), (-1,-1), 10), ])) return t def two_col_table(headers, rows, c1=88*mm, c2=86*mm, bg1=NAVY, bg2=TEAL): hrow = [Paragraph(f'<b>{h}</b>', S('TH', fontSize=9, fontName='Helvetica-Bold', textColor=white, leading=12)) for h in headers] data = [hrow] for r in rows: data.append([Paragraph(str(c), S('TC', fontSize=8.5, fontName='Helvetica', textColor=DKGRAY, leading=12)) for c in r]) t = Table(data, colWidths=[c1, c2]) ts = [('BACKGROUND', (0,0), (-1,0), bg1), ('BACKGROUND', (0,1), (-1,-1), white), ('ROWBACKGROUNDS', (0,1), (-1,-1), [white, LGRAY]), ('BOX', (0,0), (-1,-1), 0.8, MGRAY), ('INNERGRID', (0,0), (-1,-1), 0.4, MGRAY), ('TOPPADDING', (0,0), (-1,-1), 4), ('BOTTOMPADDING',(0,0), (-1,-1), 4), ('LEFTPADDING', (0,0), (-1,-1), 6)] t.setStyle(TableStyle(ts)) return t def three_col_table(headers, rows, widths=None): if not widths: widths = [58*mm, 58*mm, 58*mm] hrow = [Paragraph(f'<b>{h}</b>', S('TH3', fontSize=9, fontName='Helvetica-Bold', textColor=white, leading=12)) for h in headers] data = [hrow] for r in rows: data.append([Paragraph(str(c), S('TC3', fontSize=8.5, fontName='Helvetica', textColor=DKGRAY, leading=12)) for c in r]) t = Table(data, colWidths=widths) t.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,0), NAVY), ('ROWBACKGROUNDS', (0,1), (-1,-1), [white, LGRAY]), ('BOX', (0,0), (-1,-1), 0.8, MGRAY), ('INNERGRID', (0,0), (-1,-1), 0.4, MGRAY), ('TOPPADDING', (0,0), (-1,-1), 4), ('BOTTOMPADDING',(0,0), (-1,-1), 4), ('LEFTPADDING', (0,0), (-1,-1), 6), ])) return t def sp(n=1): return Spacer(1, n*4*mm) def hr(): return HRFlowable(width='100%', thickness=0.5, color=MGRAY, spaceAfter=3, spaceBefore=3) # ════════════════════════════════════════════════════════════════════ # CONTENT # ════════════════════════════════════════════════════════════════════ story = [] # ── COVER PAGE ────────────────────────────────────────────────────── cover_bg = Table([['']], colWidths=[174*mm], rowHeights=[257*mm]) cover_bg.setStyle(TableStyle([('BACKGROUND', (0,0), (-1,-1), NAVY)])) story.append(cover_bg) # Rebuild cover as overlapping by using a single table with all text cover_data = [ [Paragraph('NEURO-OPHTHALMOLOGY', cover_title)], [Paragraph('Exam-Oriented Notes', cover_sub)], [Spacer(1, 6*mm)], [Paragraph('RGUHS &amp; RS Singi Yatiraj Question Bank', S('CS2', fontSize=12, textColor=GOLD, fontName='Helvetica-Bold', alignment=TA_CENTER, leading=16))], [Spacer(1, 4*mm)], [HRFlowable(width='60%', thickness=1.5, color=LTBLUE, spaceBefore=2, spaceAfter=2)], [Spacer(1, 4*mm)], [Paragraph('Based on Kanski\'s Clinical Ophthalmology 10th Ed.', cover_info)], [Paragraph('Bradley &amp; Daroff\'s Neurology in Clinical Practice', cover_info)], [Spacer(1, 8*mm)], [Paragraph('Topics Covered', S('CT', fontSize=11, textColor=GOLD, fontName='Helvetica-Bold', alignment=TA_CENTER))], [Spacer(1, 2*mm)], [Paragraph('Visual Pathways • Optic Nerve • Papilloedema • IIH', cover_info)], [Paragraph('Optic Neuritis • Ischaemic Optic Neuropathy • Chiasm', cover_info)], [Paragraph('Pupil Disorders • Cranial Nerve Palsies • Nystagmus', cover_info)], [Paragraph('Retrochiasmal Lesions • Visual Field Defects', cover_info)], [Spacer(1, 10*mm)], [Paragraph('July 2026 | MBBS Final Year | Ophthalmology', S('CF', fontSize=9, textColor=MGRAY, fontName='Helvetica', alignment=TA_CENTER))], ] ct = Table(cover_data, colWidths=[174*mm]) ct.setStyle(TableStyle([ ('BACKGROUND', (0,0), (-1,-1), NAVY), ('TOPPADDING', (0,0), (-1,-1), 3), ('BOTTOMPADDING', (0,0), (-1,-1), 3), ('LEFTPADDING', (0,0), (-1,-1), 10), ('RIGHTPADDING', (0,0), (-1,-1), 10), ])) story.pop() # remove blank cover_bg story.append(ct) story.append(PageBreak()) # ── CHAPTER 1: VISUAL PATHWAYS ─────────────────────────────────────── story.append(chapter_banner('CHAPTER 1 — VISUAL PATHWAYS & VISUAL FIELD DEFECTS')) story.append(sp(0.5)) story.append(Paragraph('Anatomy of the Visual Pathway', h1)) story.append(Paragraph( 'Light → Retina (rods/cones) → Bipolar cells → Retinal Ganglion Cells (RGCs) → ' 'Optic Nerve → Optic Chiasm → Optic Tract → Lateral Geniculate Body (LGB) → ' 'Optic Radiations → Primary Visual Cortex (V1, Area 17, Calcarine fissure).', body)) story.append(sp(0.5)) story.append(Paragraph('Key Anatomical Facts', h2)) story.append(Paragraph('■ <b>Optic chiasm</b>: nasal retinal fibres (temporal field) cross; temporal fibres (nasal field) remain ipsilateral.', bullet)) story.append(Paragraph('■ <b>Meyer\'s loop</b>: inferior optic radiation loops forward into temporal lobe → lesion = "pie in the sky" defect (superior homonymous quadrantanopia).', bullet)) story.append(Paragraph('■ <b>Parietal radiation</b>: superior fibres → lesion = "pie on the floor" (inferior homonymous quadrantanopia).', bullet)) story.append(Paragraph('■ <b>Macular sparing</b>: characteristic of occipital (calcarine) lesions; dual blood supply from PCA + MCA.', bullet)) story.append(Paragraph('■ <b>Optic tract</b>: fibres from corresponding retinal points are NOT yet aligned → incongruous homonymous hemianopia.', bullet)) story.append(Paragraph('■ <b>LGB, radiation, cortex</b> lesions → increasingly congruous defects; cortex = perfectly congruous.', bullet)) story.append(sp(0.5)) story.append(Paragraph('Visual Field Defect Localisation', h2)) vfd_data = [ ['Defect', 'Lesion Site'], ['Monocular blindness', 'Optic nerve (ipsilateral)'], ['Central scotoma', 'Optic nerve / papillomacular bundle'], ['Junctional scotoma (ipsilateral central + contralateral upper temporal)', 'Optic nerve–chiasm junction'], ['Bitemporal hemianopia', 'Optic chiasm (pituitary adenoma, craniopharyngioma)'], ['Incongruous homonymous hemianopia', 'Optic tract'], ['Homonymous superior quadrantanopia ("pie in sky")', 'Temporal lobe (Meyer\'s loop)'], ['Homonymous inferior quadrantanopia ("pie on floor")', 'Parietal lobe (superior radiation)'], ['Congruous homonymous hemianopia with macular sparing', 'Occipital cortex (PCA infarct)'], ['Homonymous hemianopia with macular splitting', 'Occipital lobe (traumatic)'], ] story.append(two_col_table(['Visual Field Defect', 'Lesion Site'], vfd_data[1:], c1=90*mm, c2=84*mm)) story.append(sp(0.5)) story.append(mnemonic_box('Visual Field', 'LEMON: Lateral chiasm = Nasal fibres affected = bitemporAl → pituitary expands from Middle Of chiasm')) story.append(sp(0.3)) story.append(mnemonic_box('Meyer\'s Loop', '"TIMothy goes to the PIE shop" — Temporal lobe → Inferior fibres → Meyer\'s loop → PIE in sky defect')) story.append(sp(0.5)) story.append(exam_box([ 'Q1. Draw and label the visual pathway. Mention the field defect at each level. (RGUHS 10M, 2019, 2022)', 'Q2. What is bitemporal hemianopia? What are its causes? Describe the visual field changes in pituitary adenoma. (RGUHS 5M, 2021)', 'Q3. A patient has "pie in the sky" defect. Where is the lesion? What structure is involved? (RS Singi Yatiraj)', 'Q4. What is macular sparing? What is its significance? (RGUHS 3M)', 'Q5. Junctional scotoma — describe and give its anatomical basis. (RS Singi Yatiraj)', 'Q6. Difference between congruous and incongruous homonymous hemianopia. (RGUHS 5M)', ])) story.append(PageBreak()) # ── CHAPTER 2: OPTIC NERVE ────────────────────────────────────────── story.append(chapter_banner('CHAPTER 2 — OPTIC NERVE DISORDERS', TEAL)) story.append(sp(0.5)) story.append(Paragraph('Signs of Optic Nerve Dysfunction', h1)) signs_data = [ ['Sign', 'Details'], ['Reduced visual acuity', 'Does not recover fully with refraction'], ['RAPD (Marcus Gunn pupil)', 'Afferent pupillary defect — swinging torch test; most sensitive sign'], ['Colour desaturation', 'Red desaturation; compare red cap OD vs OS'], ['Visual field defect', 'Central/paracentral scotoma most common'], ['VEP delay', 'Increased P100 latency (normal ~100 ms)'], ['Pale/swollen disc', 'Depends on lesion location (retrobulbar = normal disc early)'], ] story.append(two_col_table(['Sign', 'Details'], signs_data[1:])) story.append(sp(0.5)) story.append(Paragraph('Classification of Optic Neuropathy', h2)) story.append(Paragraph('<b>By Cause:</b>', h3)) story.append(Paragraph('■ Inflammatory (optic neuritis — demyelinating, infectious, autoimmune)', bullet)) story.append(Paragraph('■ Ischaemic (NAION, AAION)', bullet)) story.append(Paragraph('■ Compressive (tumour, aneurysm, thyroid orbitopathy)', bullet)) story.append(Paragraph('■ Infiltrative (sarcoidosis, lymphoma, leukaemia)', bullet)) story.append(Paragraph('■ Hereditary (LHON, Dominant optic atrophy, Wolfram syndrome)', bullet)) story.append(Paragraph('■ Toxic/Nutritional (ethambutol, methanol, B12/folate deficiency)', bullet)) story.append(Paragraph('■ Traumatic', bullet)) story.append(sp(0.5)) story.append(Paragraph('Demyelinating Optic Neuritis (Most Important)', h1)) story.append(Paragraph( 'Most common cause of acute unilateral visual loss in young adults (20–45 yrs). ' 'Strongly associated with Multiple Sclerosis (MS). Pathology: demyelination of optic nerve fibres.', body)) story.append(sp(0.3)) story.append(Paragraph('Clinical Features', h2)) story.append(Paragraph('■ <b>Acute unilateral</b> visual loss (rarely bilateral)', bullet)) story.append(Paragraph('■ <b>Pain on eye movement</b> (cardinal feature — 92% of cases)', bullet)) story.append(Paragraph('■ Dyschromatopsia — red desaturation', bullet)) story.append(Paragraph('■ <b>RAPD</b> (Marcus Gunn pupil)', bullet)) story.append(Paragraph('■ <b>Uhthoff\'s phenomenon</b>: worsening with heat/exercise', bullet)) story.append(Paragraph('■ <b>Pulfrich phenomenon</b>: moving pendulum appears to swing in ellipse', bullet)) story.append(Paragraph('■ Fundus: 2/3 retrobulbar (disc looks normal) — "patient sees nothing, doctor sees nothing"', bullet)) story.append(Paragraph(' 1/3 papillitis (disc swollen, hyperaemic)', bullet)) story.append(Paragraph('■ VEP: P100 latency prolonged (even after recovery)', bullet)) story.append(sp(0.3)) story.append(Paragraph('Treatment (ONTT — Optic Neuritis Treatment Trial)', h2)) story.append(Paragraph('■ IV methylprednisolone 250 mg QID × 3 days → oral prednisolone 1 mg/kg × 11 days.', bullet)) story.append(Paragraph('■ Speeds recovery but does not improve final visual outcome.', bullet)) story.append(Paragraph('■ Oral steroids alone CONTRAINDICATED (↑ recurrence risk).', bullet)) story.append(Paragraph('■ Risk of MS: 50% at 15 years; if >2 MRI lesions → 72% at 10 years.', bullet)) story.append(sp(0.3)) story.append(tip_box('Remember ONTT findings: IV steroids speed recovery; oral steroids alone increase recurrence; ' 'final VA at 6 months same in all treatment groups. 87% recover to 20/25 or better.')) story.append(sp(0.3)) story.append(mnemonic_box('Optic Neuritis Features', '"RAPID CUPS" — RAPD, Ache in eye, Pain on movement, ' 'Impaired colour, Dyschromatopsia, Central scotoma, Uhthoff, Pulfrich, Spontaneous recovery')) story.append(sp(0.3)) story.append(exam_box([ 'Q1. Describe the clinical features, investigations and treatment of optic neuritis. (RGUHS 10M, 2018, 2023)', 'Q2. What is Uhthoff\'s phenomenon? What is Pulfrich phenomenon? (RGUHS 3M)', 'Q3. Write about ONTT. What is the significance of its findings? (RS Singi Yatiraj)', 'Q4. What is Marcus Gunn pupil? How is it tested? (RGUHS 5M)', 'Q5. Differentiate papillitis from retrobulbar neuritis. (RGUHS 5M, 2020)', 'Q6. Optic neuritis and its association with MS. (RGUHS 5M, 2022)', ])) story.append(sp(0.5)) story.append(hr()) # Optic Atrophy story.append(Paragraph('Optic Atrophy', h1)) story.append(Paragraph( 'Pallor of the optic disc due to axonal degeneration and replacement by glial tissue. ' 'NOT a diagnosis — it is the end result of various optic nerve diseases.', body)) story.append(sp(0.3)) story.append(Paragraph('Types', h2)) oa_types = [ ['Type', 'Disc Appearance', 'Causes'], ['Primary (Simple)', 'White, flat, well-defined margins, normal cup', 'Retrobulbar neuritis, compression, toxic, hereditary'], ['Secondary', 'Dirty grey, blurred margins, obliterated cup', 'Post-papilloedema, post-papillitis'], ['Consecutive', 'Waxy pallor, attenuated vessels', 'Widespread retinal disease (CRAO, RP, choroiditis)'], ['Glaucomatous', 'Deep cupped disc, "bean pot" appearance, C/D ratio >0.7', 'Primary open-angle glaucoma'], ] story.append(three_col_table(['Type', 'Disc Appearance', 'Causes'], oa_types[1:], widths=[40*mm, 65*mm, 69*mm])) story.append(sp(0.3)) story.append(Paragraph('Causes of Optic Atrophy (RGUHS Favourite)', h2)) story.append(Paragraph('■ <b>Consecutive</b>: retinitis pigmentosa, CRAO, chorioretinitis', bullet)) story.append(Paragraph('■ <b>Post-neuritic</b>: after papillitis, retrobulbar neuritis', bullet)) story.append(Paragraph('■ <b>Post-papilloedematous</b>: long-standing raised ICP', bullet)) story.append(Paragraph('■ <b>Compressive</b>: tumour, aneurysm, thyroid eye disease', bullet)) story.append(Paragraph('■ <b>Traumatic</b>: direct / indirect optic nerve injury', bullet)) story.append(Paragraph('■ <b>Toxic</b>: methanol, ethambutol, chloroquine, tobacco-alcohol amblyopia', bullet)) story.append(Paragraph('■ <b>Hereditary</b>: Leber\'s LHON, Dominant OA (OPA1 mutation)', bullet)) story.append(Paragraph('■ <b>Ischaemic</b>: NAION, AAION (GCA)', bullet)) story.append(Paragraph('■ <b>Nutritional</b>: B12 deficiency, folate deficiency', bullet)) story.append(sp(0.3)) story.append(mnemonic_box('Causes of Optic Atrophy', '"CANT PH IT" — Consecutive, After-neuritis, Nutritional, Toxic, ' 'Post-papilloedema, Hereditary, Ischaemic, Trauma')) story.append(sp(0.3)) story.append(exam_box([ 'Q1. Classify optic atrophy. Describe the fundus appearance in each type. (RGUHS 10M, 2019)', 'Q2. Enumerate causes of optic atrophy. (RGUHS 5M, 2021)', 'Q3. Differentiate primary from secondary optic atrophy. (RS Singi Yatiraj)', 'Q4. What is bow-tie/band atrophy? When does it occur? (RS Singi Yatiraj)', ])) story.append(PageBreak()) # ── CHAPTER 3: PAPILLOEDEMA & IIH ─────────────────────────────────── story.append(chapter_banner('CHAPTER 3 — PAPILLOEDEMA & IDIOPATHIC INTRACRANIAL HYPERTENSION')) story.append(sp(0.5)) story.append(Paragraph('Papilloedema', h1)) story.append(Paragraph( 'Bilateral optic disc swelling caused by raised intracranial pressure (ICP). ' 'PASSIVE disc swelling — no primary optic nerve disease. ' 'Distinguished from papillitis by: bilateral, normal VA early, enlarged blind spot as earliest field defect.', body)) story.append(sp(0.3)) story.append(Paragraph('Stages of Papilloedema (Frisen Grading)', h2)) frisen = [ ['Grade', 'Features'], ['Grade 0 (Normal)', 'C-shaped halo, nasal blurring only'], ['Grade 1 (Early)', 'Mild disc hyperaemia, peripapillary halo, C-shaped halo nasally, preserved cup'], ['Grade 2 (Moderate)', 'Obscuration of nasal disc border, disc elevation, halo all around'], ['Grade 3 (Marked)', 'Obscuration of all disc borders, no cup visible, ≥1 major vessel obscured at disc margin'], ['Grade 4 (Severe)', 'Total disc obscuration, ≥1 major vessel obscured on disc surface'], ['Grade 5 (Very severe)', 'All vessels partially or totally obscured; obliteration of optic cup'], ] story.append(two_col_table(['Grade', 'Features'], frisen[1:], c1=55*mm, c2=119*mm)) story.append(sp(0.3)) story.append(Paragraph('Clinical Features', h2)) story.append(Paragraph('■ <b>Symptoms</b>: headache (worse in morning, with valsalva), nausea/vomiting, ' 'transient visual obscurations (TVOs) — last seconds, precipitated by posture change.', bullet)) story.append(Paragraph('■ <b>Diplopia</b>: 6th nerve palsy (false localising sign) — stretching over petrous tip.', bullet)) story.append(Paragraph('■ <b>VA</b>: usually normal early; reduced late (secondary optic atrophy).', bullet)) story.append(Paragraph('■ <b>Earliest field defect</b>: enlarged blind spot (expanded arcuate defect).', bullet)) story.append(Paragraph('■ <b>Spontaneous venous pulsations (SVP)</b>: absent SVP suggests raised ICP (but presence does NOT exclude it).', bullet)) story.append(sp(0.3)) story.append(Paragraph('Investigation of Papilloedema', h2)) story.append(Paragraph('1. <b>Neuroimaging (MRI/CT brain)</b> — MUST be done BEFORE LP to exclude SOL.', bullet)) story.append(Paragraph('2. <b>LP</b>: opening pressure >25 cmH₂O (>20 = borderline).', bullet)) story.append(Paragraph('3. <b>B-scan USS</b>: optic nerve sheath diameter >5 mm at 3 mm behind globe.', bullet)) story.append(Paragraph('4. <b>VEP</b>: may be delayed.', bullet)) story.append(Paragraph('5. <b>Fluorescein angiography</b>: leakage from disc capillaries.', bullet)) story.append(sp(0.3)) story.append(tip_box('LP is CONTRAINDICATED until imaging excludes a space-occupying lesion. ' '6th nerve palsy in papilloedema is a FALSE LOCALISING SIGN.')) story.append(sp(0.3)) story.append(Paragraph('Causes of Papilloedema', h2)) story.append(Paragraph('■ <b>Intracranial tumours</b> (most common cause of raised ICP)', bullet)) story.append(Paragraph('■ <b>Idiopathic Intracranial Hypertension (IIH)</b>', bullet)) story.append(Paragraph('■ <b>Cerebral venous sinus thrombosis</b>', bullet)) story.append(Paragraph('■ <b>Meningitis / encephalitis</b>', bullet)) story.append(Paragraph('■ <b>Hydrocephalus</b>', bullet)) story.append(Paragraph('■ <b>Hypertensive encephalopathy</b>', bullet)) story.append(Paragraph('■ <b>Subarachnoid haemorrhage</b>', bullet)) story.append(sp(0.3)) story.append(Paragraph('Papilloedema vs Papillitis — Key Differentials', h2)) diff = [ ['Feature', 'Papilloedema', 'Papillitis'], ['Laterality', 'Bilateral', 'Usually unilateral'], ['Visual acuity', 'Normal (early)', 'Markedly reduced'], ['Visual field', 'Enlarged blind spot', 'Central scotoma'], ['Pain on movement', 'Absent', 'Present'], ['RAPD', 'Absent (bilateral = no RAPD)', 'Present'], ['Cause', 'Raised ICP', 'Optic nerve inflammation'], ['Prognosis', 'Reversible if ICP treated', 'Usually recovers'], ] story.append(three_col_table(['Feature', 'Papilloedema', 'Papillitis'], diff[1:], widths=[50*mm, 62*mm, 62*mm])) story.append(sp(0.3)) story.append(exam_box([ 'Q1. Describe the stages of papilloedema (Frisen grading). How does it differ from papillitis? (RGUHS 10M)', 'Q2. What are the earliest signs and symptoms of raised intracranial pressure in the eye? (RGUHS 5M, 2023)', 'Q3. What is a false localizing sign in raised ICP? Explain the mechanism. (RGUHS 3M)', 'Q4. Enumerate causes of bilateral disc swelling. (RS Singi Yatiraj)', 'Q5. What is enlarged blind spot? What does it indicate? (RGUHS 2M)', ])) story.append(sp(0.5)) story.append(hr()) # IIH story.append(Paragraph('Idiopathic Intracranial Hypertension (IIH) / Pseudotumour Cerebri', h1)) story.append(Paragraph( 'Raised ICP with no structural cause, normal CSF composition, normal imaging. ' 'Classically: <b>obese young women</b> of childbearing age.', body)) story.append(sp(0.3)) story.append(Paragraph('Modified Dandy Criteria for IIH', h2)) story.append(Paragraph('1. Symptoms/signs of raised ICP (headache, papilloedema, TVOs)', bullet)) story.append(Paragraph('2. LP opening pressure ≥25 cmH₂O in adults', bullet)) story.append(Paragraph('3. Normal CSF composition', bullet)) story.append(Paragraph('4. Normal neuroimaging (no structural/vascular cause)', bullet)) story.append(Paragraph('5. No other cause of raised ICP found', bullet)) story.append(sp(0.3)) story.append(Paragraph('Risk Factors / Associations', h2)) story.append(Paragraph('■ Obesity (BMI >30), especially recent weight gain', bullet)) story.append(Paragraph('■ Female sex, childbearing age', bullet)) story.append(Paragraph('■ Drugs: Tetracyclines (minocycline, doxycycline), Vitamin A/retinoids, steroids (withdrawal), OCP, lithium', bullet)) story.append(Paragraph('■ Venous sinus thrombosis', bullet)) story.append(Paragraph('■ Anaemia, sleep apnoea', bullet)) story.append(sp(0.3)) story.append(Paragraph('Treatment', h2)) story.append(Paragraph('■ <b>Weight loss</b> (10% weight loss → significant ICP reduction)', bullet)) story.append(Paragraph('■ <b>Acetazolamide</b> (carbonic anhydrase inhibitor — reduces CSF production) — first-line drug', bullet)) story.append(Paragraph('■ <b>Topiramate</b> (also aids weight loss)', bullet)) story.append(Paragraph('■ Serial LP (temporary relief)', bullet)) story.append(Paragraph('■ <b>CSF diversion</b>: Lumboperitoneal shunt / Ventriculoperitoneal shunt', bullet)) story.append(Paragraph('■ <b>Optic nerve sheath fenestration (ONSF)</b>: for vision-threatening papilloedema', bullet)) story.append(Paragraph('■ <b>Venous sinus stenting</b>: if dural venous sinus stenosis identified', bullet)) story.append(sp(0.3)) story.append(mnemonic_box('IIH Drugs causing it', '"VATS" — Vitamin A/retinoids, Antibiotics (tetracyclines), Thyroxine (excess), Steroids (withdrawal)')) story.append(sp(0.3)) story.append(exam_box([ 'Q1. What is IIH? Describe its clinical features and treatment. (RGUHS 10M, 2022)', 'Q2. Modified Dandy criteria for IIH. (RGUHS 5M)', 'Q3. What is the role of optic nerve sheath fenestration? (RS Singi Yatiraj)', 'Q4. What drugs cause IIH? (RGUHS 3M)', ])) story.append(PageBreak()) # ── CHAPTER 4: ISCHAEMIC OPTIC NEUROPATHY ────────────────────────── story.append(chapter_banner('CHAPTER 4 — ISCHAEMIC OPTIC NEUROPATHY', GREEN)) story.append(sp(0.5)) story.append(Paragraph('Overview', h2)) ion_compare = [ ['Feature', 'NAION', 'AAION (GCA)'], ['Age', '>50 years', '>70 years'], ['Onset', 'Sudden, painless', 'Sudden, may have periocular pain'], ['Visual loss', 'Altitudinal defect (inferior > superior)', 'Severe (usually permanent)'], ['Disc appearance', 'Pale or hyperaemic swelling; "disc at risk"', 'Chalky white pale disc swelling'], ['ESR/CRP', 'Normal', 'Markedly elevated'], ['Temporal artery', 'Normal', 'Thickened, nodular, tender, pulseless'], ['Treatment', 'No proven treatment; aspirin, control VRF', 'URGENT IV methylprednisolone 500mg–1g/day × 3 days, then oral'], ['Prognosis', 'Visual loss usually permanent; 40% improve slightly', 'Very poor; 2nd eye at risk (25% despite steroids)'], ['Pathology', 'Non-inflammatory occlusion of posterior ciliary arteries', 'Giant cell (granulomatous) arteritis of posterior ciliary arteries'], ] story.append(three_col_table(['Feature', 'NAION', 'AAION (GCA)'], ion_compare[1:], widths=[42*mm, 66*mm, 66*mm])) story.append(sp(0.3)) story.append(Paragraph('Giant Cell Arteritis (GCA) — Key Points', h2)) story.append(Paragraph('■ Systemic granulomatous vasculitis of medium/large vessels; affects >50 yrs', bullet)) story.append(Paragraph('■ Symptoms: headache (temporal), jaw claudication, scalp tenderness, malaise, weight loss, PMR', bullet)) story.append(Paragraph('■ <b>Jaw claudication</b> = most specific symptom', bullet)) story.append(Paragraph('■ ESR >50 mm/h + CRP elevated; temporal artery biopsy (TAB) = gold standard diagnosis', bullet)) story.append(Paragraph('■ Ophthalmoscopy: chalky-white disc oedema, altitudinal field defect', bullet)) story.append(Paragraph('■ NEVER delay steroids to await TAB result — treat empirically if suspected!', bullet)) story.append(Paragraph('■ TAB remains positive for 2–6 weeks after starting steroids', bullet)) story.append(sp(0.3)) story.append(Paragraph('Foster Kennedy Syndrome', h2)) story.append(Paragraph( '<b>True:</b> Frontal lobe SOL → ipsilateral optic atrophy (direct compression) + ' 'contralateral papilloedema (raised ICP). Caused by olfactory groove / sphenoidal meningioma.', body)) story.append(Paragraph( '<b>Pseudo-Foster Kennedy:</b> Sequential bilateral NAION → one eye with active disc swelling + ' 'other eye with old optic atrophy from previous episode. NO raised ICP.', body)) story.append(sp(0.3)) story.append(exam_box([ 'Q1. Compare NAION and AAION. (RGUHS 10M, 2021, 2024)', 'Q2. What is giant cell arteritis? How does it affect the eye? (RGUHS 5M)', 'Q3. What is Foster Kennedy syndrome? How is it different from pseudo-Foster Kennedy? (RGUHS 5M, RS Singi Yatiraj)', 'Q4. What is the investigation of choice in GCA? What are the histological findings? (RGUHS 3M)', 'Q5. Enumerate causes of sudden painless loss of vision. (RGUHS 5M)', ])) story.append(PageBreak()) # ── CHAPTER 5: CHIASM & RETROCHIASMAL ─────────────────────────────── story.append(chapter_banner('CHAPTER 5 — CHIASM, RETROCHIASMAL PATHWAYS & CORTEX', TEAL)) story.append(sp(0.5)) story.append(Paragraph('Chiasmal Lesions', h1)) story.append(Paragraph('Chiasm position: pre-fixed (8%) → tract lesions first; post-fixed (4%) → nerve lesions first; normal (88%).', body)) story.append(sp(0.3)) story.append(Paragraph('Causes of Chiasmal Compression', h2)) story.append(Paragraph('■ <b>Pituitary adenoma</b> (most common): expands superiorly → bitemporal superior quadrantanopia → bitemporal hemianopia', bullet)) story.append(Paragraph('■ <b>Craniopharyngioma</b>: arises above chiasm → bitemporal inferior > superior quadrantanopia (upper nasal fibres affected first)', bullet)) story.append(Paragraph('■ <b>Meningioma</b>: tuberculum sellae, diaphragma sellae', bullet)) story.append(Paragraph('■ <b>Aneurysm</b>: ICA, ACA, AComm', bullet)) story.append(Paragraph('■ <b>Glioma</b>: optic chiasm glioma (NF1)', bullet)) story.append(sp(0.3)) story.append(Paragraph('Bow-Tie (Band) Atrophy', h2)) story.append(Paragraph( 'Occurs with chiasmal or optic tract lesions. Nasal retinal fibres (crossing fibres) are affected. ' 'Disc pallor involves nasal and temporal aspects (superior and inferior fibres relatively spared) → ' 'horizontal band of pallor. Contralateral disc shows diffuse pallor (temporal retinal fibres, uncrossed, atrophy).', body)) story.append(sp(0.3)) story.append(Paragraph('Retrochiasmal Pathways', h1)) retro = [ ['Structure', 'Visual Field Defect', 'Congruity', 'Key Feature'], ['Optic tract', 'Incongruous homonymous hemianopia', 'Incongruous', 'Wernicke hemianopic pupil; RAPD in contralateral eye'], ['Lateral geniculate body', 'Asymmetric hemianopic defect', 'Incongruous', 'Wedge-shaped defects (dual blood supply)'], ['Temporal lobe (Meyer\'s loop)', 'Superior homonymous quadrantanopia ("pie in sky")', 'Moderate', 'Associated memory/seizure'], ['Parietal lobe', 'Inferior homonymous quadrantanopia ("pie on floor")', 'Good', 'Associated neglect, optokinetic asymmetry'], ['Occipital lobe (striate cortex)', 'Congruous homonymous hemianopia with macular sparing', 'Congruous', 'Macular sparing; PCA territory'], ] story.append(three_col_table(['Structure', 'VF Defect', 'Congruity & Key Feature'], [[r[0], r[1]+'\n'+r[2], r[3]] for r in retro[1:]], widths=[40*mm, 72*mm, 62*mm])) story.append(sp(0.3)) story.append(Paragraph('Wernicke Hemianopic Pupil', h2)) story.append(Paragraph( 'Optic tract lesion → hemianopic pupil. Light shone on the blind hemiretina → NO pupil constriction. ' 'Light on the seeing hemiretina → normal constriction. ' 'Difficult to elicit clinically (scatter of light). Confirms optic tract lesion.', body)) story.append(sp(0.3)) story.append(exam_box([ 'Q1. Describe the visual field defects in retrochiasmal lesions. (RGUHS 10M)', 'Q2. What is macular sparing? Why does it occur in occipital lobe lesions? (RGUHS 5M)', 'Q3. What are the causes of bitemporal hemianopia? Draw the visual fields. (RGUHS 5M, 2020)', 'Q4. What is Wernicke hemianopic pupil? (RS Singi Yatiraj)', 'Q5. Bow-tie atrophy — describe and explain. (RS Singi Yatiraj)', ])) story.append(PageBreak()) # ── CHAPTER 6: PUPIL DISORDERS ────────────────────────────────────── story.append(chapter_banner('CHAPTER 6 — PUPIL DISORDERS')) story.append(sp(0.5)) story.append(Paragraph('Pupillary Pathway', h1)) story.append(Paragraph('<b>Light Reflex (Afferent limb):</b> Retina → Optic nerve → Optic chiasm → Optic tract → ' 'Pretectal nucleus (dorsal midbrain) → BILATERAL Edinger-Westphal (EW) nuclei', bullet)) story.append(Paragraph('<b>Efferent limb:</b> EW nucleus → CN III → Ciliary ganglion → Short ciliary nerves → Sphincter pupillae', bullet)) story.append(Paragraph('<b>Near reflex:</b> Cortex → EW nucleus → Ciliary ganglion → Sphincter + Ciliary muscle (accommodation + miosis + convergence)', bullet)) story.append(Paragraph('<b>Sympathetic (dilator):</b> Hypothalamus → Ciliospinal centre of Budge (C8-T1) → Superior cervical ganglion → Long ciliary nerve → Dilator pupillae', bullet)) story.append(sp(0.3)) story.append(Paragraph('Key Pupil Syndromes', h1)) pupils_data = [ ['Syndrome', 'Features', 'Cause'], ['Horner Syndrome', 'Miosis + Ptosis + Anhidrosis + Enophthalmos (apparent)\nIPSILATERAL', '1st order: hypothalamus-T1 (stroke, MS, tumour)\n2nd order: T1-SCG (Pancoast, thyroid, neck surgery)\n3rd order: SCG-eye (carotid dissection, cavernous sinus)'], ['Adie (Tonic) Pupil', 'Mydriasis, sluggish light reflex, TONIC near response\nVermiform iris movements on slit lamp\n"Little old Adie" = old cases become miotic', 'Ciliary ganglion denervation (viral). Young women. Holmes-Adie = + absent ankle jerks (Ross = + anhidrosis)'], ['Argyll Robertson Pupil', 'BILATERAL miosis\nIrregular pupils\nLight-near DISSOCIATION (react to near, NOT light)\n"Prostitute pupil — accommodates but does not react"', 'Neurosyphilis (classic). Also: DM, MS, pinealoma, Parinaud syndrome'], ['Marcus Gunn Pupil (RAPD)', 'Relative afferent pupillary defect\nSwinging torch test: affected eye dilates when light swings from good to bad eye', 'Unilateral optic nerve disease, severe retinal disease'], ['CN III Palsy (pupil-involving)', 'Mydriasis (dilated fixed pupil)\n+ptosis + "down and out" eye', 'EMERGENCY: posterior communicating artery aneurysm (PComm)'], ['Pharmacological mydriasis', 'Dilated pupil, NO ptosis, NO diplopia\nFails to constrict with 1% pilocarpine', 'Anticholinergic drops (atropine, cyclopentolate, tropicamide)'], ] story.append(three_col_table(['Syndrome', 'Features', 'Cause/Notes'], pupils_data[1:], widths=[38*mm, 74*mm, 62*mm])) story.append(sp(0.3)) story.append(Paragraph('Pharmacological Diagnosis of Horner Syndrome', h2)) story.append(Paragraph('■ <b>Cocaine 4–10%</b>: Confirms Horner (no dilation in Horner eye — all 3 orders). Prevents noradrenaline reuptake → dilates normal pupil only.', bullet)) story.append(Paragraph('■ <b>Apraclonidine 0.5–1%</b>: Confirms Horner. Alpha-2 agonist → paradoxical dilation of Horner pupil (denervation supersensitivity). Reversal of anisocoria.', bullet)) story.append(Paragraph('■ <b>Hydroxyamphetamine 1%</b>: Differentiates 3rd order (postganglionic) from 1st/2nd order. Releases NA from terminal → NO dilation in 3rd order lesion.', bullet)) story.append(Paragraph('■ <b>Pilocarpine 0.1%</b>: Confirms Adie pupil (supersensitivity → marked constriction). 1% pilocarpine fails to constrict pharmacological mydriasis.', bullet)) story.append(sp(0.3)) story.append(Paragraph('Light-Near Dissociation — Causes', h2)) story.append(Paragraph('■ Neurosyphilis (Argyll Robertson)', bullet)) story.append(Paragraph('■ Parinaud syndrome (dorsal midbrain — compresses internuncial neurones)', bullet)) story.append(Paragraph('■ Adie tonic pupil', bullet)) story.append(Paragraph('■ Diabetes mellitus', bullet)) story.append(Paragraph('■ Aberrant regeneration of CN III', bullet)) story.append(Paragraph('■ Myotonic dystrophy', bullet)) story.append(sp(0.3)) story.append(mnemonic_box('Horner Syndrome', '"SAME" — Sympathetic pathway, Anhidrosis, Miosis, Enophthalmos (apparent) + ptosis')) story.append(sp(0.3)) story.append(mnemonic_box('Light-Near Dissociation Causes', '"PANDAS" — Parinaud, Adie, Neurosyphilis, Diabetes, Aberrant regeneration, Sarcoidosis')) story.append(sp(0.3)) story.append(exam_box([ 'Q1. Describe the features of Argyll Robertson pupil. What is its pathogenesis? (RGUHS 10M, 2017, 2022)', 'Q2. What is Horner syndrome? Describe its features, localisation and pharmacological testing. (RGUHS 10M, 2019)', 'Q3. What is light-near dissociation? Enumerate its causes. (RGUHS 5M)', 'Q4. Describe Adie tonic pupil. What is Holmes-Adie syndrome? (RGUHS 5M, RS Singi Yatiraj)', 'Q5. Marcus Gunn pupil — mechanism and clinical testing. (RGUHS 5M, 2023)', 'Q6. How do you differentiate a surgical 3rd nerve palsy from a medical 3rd nerve palsy? (RS Singi Yatiraj)', 'Q7. What is the significance of a dilated pupil in CN III palsy? (RGUHS 3M)', ])) story.append(PageBreak()) # ── CHAPTER 7: OCULAR MOTOR NERVE PALSIES ─────────────────────────── story.append(chapter_banner('CHAPTER 7 — OCULAR MOTOR NERVE PALSIES', TEAL)) story.append(sp(0.5)) story.append(Paragraph('3rd Nerve (Oculomotor) Palsy', h1)) story.append(Paragraph( '3rd nerve innervates: SR, MR, IR, IO, levator palpebrae, sphincter pupillae (via ciliary ganglion), ciliary muscle.', body)) story.append(sp(0.3)) story.append(Paragraph('Clinical Features of Complete 3rd Nerve Palsy', h2)) story.append(Paragraph('■ Complete <b>ptosis</b> (levator paralysis)', bullet)) story.append(Paragraph('■ Eye deviated <b>down and out</b> (unopposed SO + LR action)', bullet)) story.append(Paragraph('■ Limitation of adduction, elevation, depression', bullet)) story.append(Paragraph('■ <b>Fixed dilated pupil</b> (surgical/compressive lesion — pupillomotor fibres on the outside)', bullet)) story.append(Paragraph('■ Pupil-sparing = usually medical/ischaemic (microvascular; DM, HTN)', bullet)) story.append(sp(0.3)) story.append(Paragraph('Surgical vs Medical 3rd Nerve Palsy', h2)) svs = [ ['Feature', 'Surgical (Compressive)', 'Medical (Ischaemic)'], ['Pupil', 'Dilated, fixed (mydriasis)', 'Spared (normal)'], ['Pain', 'Severe (sudden onset)', 'Mild to moderate'], ['Cause', 'PComm aneurysm, herniation, tumour', 'DM, HTN, atherosclerosis'], ['Onset', 'Acute, may progress', 'Acute, stable, spontaneous recovery'], ['Action', 'EMERGENCY — neuroimaging immediately', 'Observe; investigate for DM/HTN'], ['Why', 'Pupillomotor fibres peripheral (compressed first)', 'Central ischaemia spares peripheral fibres'], ] story.append(three_col_table(['Feature', 'Surgical', 'Medical'], svs[1:], widths=[40*mm, 67*mm, 67*mm])) story.append(sp(0.3)) story.append(Paragraph('Midbrain Syndromes with 3rd Nerve Palsy', h2)) story.append(Paragraph('■ <b>Weber syndrome</b>: CN III palsy + contralateral hemiplegia (cerebral peduncle)', bullet)) story.append(Paragraph('■ <b>Benedikt syndrome</b>: CN III palsy + contralateral extrapyramidal signs/tremor (red nucleus)', bullet)) story.append(Paragraph('■ <b>Nothnagel syndrome</b>: CN III palsy + ipsilateral cerebellar ataxia (cerebellar peduncle)', bullet)) story.append(Paragraph('■ <b>Claude syndrome</b>: Benedikt + Nothnagel', bullet)) story.append(sp(0.3)) story.append(Paragraph('4th Nerve (Trochlear) Palsy', h1)) story.append(Paragraph('Innervates: Superior oblique (SO). SO depresses and intorts the eye.', body)) story.append(sp(0.3)) story.append(Paragraph('Clinical Features', h2)) story.append(Paragraph('■ <b>Vertical diplopia</b> (worse on downgaze, e.g. reading stairs)', bullet)) story.append(Paragraph('■ Affected eye is <b>hypertropic</b>', bullet)) story.append(Paragraph('■ Head tilt to opposite shoulder (compensatory)', bullet)) story.append(Paragraph('■ Chin depression (to avoid diplopia in primary)', bullet)) story.append(sp(0.3)) story.append(Paragraph('Parks Three-Step Test (for SO palsy)', h2)) story.append(Paragraph('<b>Step 1:</b> Identify hypertropic eye → narrows to 4 muscles (depressors of hyper eye + elevators of hypo eye)', bullet)) story.append(Paragraph('<b>Step 2:</b> Which gaze increases deviation? SO weakness → WOOG (Worse On Opposite Gaze)', bullet)) story.append(Paragraph('<b>Step 3:</b> Bielschowsky Head Tilt Test (BHTT) → SO palsy = worse on ipsilateral head tilt (BOOT — Better On Opposite Tilt)', bullet)) story.append(sp(0.3)) story.append(tip_box('4th nerve: ONLY cranial nerve to decussate in the brainstem AND exit dorsally. ' 'Most common cause: trauma (50%). Congenital is also common.')) story.append(sp(0.3)) story.append(Paragraph('6th Nerve (Abducens) Palsy', h1)) story.append(Paragraph('Innervates: Lateral rectus. LR abducts the eye.', body)) story.append(sp(0.3)) story.append(Paragraph('Clinical Features', h2)) story.append(Paragraph('■ <b>Horizontal diplopia</b> (worse on ipsilateral gaze)', bullet)) story.append(Paragraph('■ Eye deviated medially (esotropia)', bullet)) story.append(Paragraph('■ Head turn to side of palsy (compensatory)', bullet)) story.append(sp(0.3)) story.append(Paragraph('Causes of 6th Nerve Palsy', h2)) story.append(Paragraph('■ <b>False localising sign</b> in raised ICP (most common exam answer)', bullet)) story.append(Paragraph('■ Wernicke\'s encephalopathy', bullet)) story.append(Paragraph('■ Pontine lesion (glioma, demyelination, infarct)', bullet)) story.append(Paragraph('■ Gradenigo syndrome: petrositis (Otitis media + CN VI + CN V + ear pain)', bullet)) story.append(Paragraph('■ Cavernous sinus disease (thrombosis, fistula, meningioma)', bullet)) story.append(Paragraph('■ Microvascular (DM, HTN)', bullet)) story.append(sp(0.3)) story.append(Paragraph('7th Nerve (Facial) Palsy — Ophthalmic Aspects', h2)) story.append(Paragraph('■ <b>UMN lesion</b>: lower face/mouth affected; forehead spared (bilateral cortical representation)', bullet)) story.append(Paragraph('■ <b>LMN lesion (Bell\'s palsy)</b>: ENTIRE ipsilateral face + forehead paralysed', bullet)) story.append(Paragraph('■ Corneal reflex: afferent = V1 (ophthalmic); efferent = VII (orbicularis)', bullet)) story.append(Paragraph('■ <b>Lagophthalmos</b>: inability to close eye → exposure keratopathy', bullet)) story.append(Paragraph('■ <b>Ramsay Hunt syndrome</b>: HZV reactivation at geniculate ganglion → ipsilateral facial palsy + ear pain + herpetic vesicles (ear canal, auricle, palate)', bullet)) story.append(Paragraph('■ Bell\'s phenomenon: upward and outward rolling of eye on attempted closure', bullet)) story.append(sp(0.3)) story.append(exam_box([ 'Q1. Describe the clinical features and causes of 3rd cranial nerve palsy. (RGUHS 10M, 2018)', 'Q2. Differentiate between surgical and medical 3rd nerve palsy. (RGUHS 5M, 2021, 2023)', 'Q3. Weber vs Benedikt syndrome. (RS Singi Yatiraj)', 'Q4. Parks three-step test — describe in detail. (RGUHS 10M, RS Singi Yatiraj)', 'Q5. What is 6th nerve palsy? Why is it a false localising sign? (RGUHS 5M)', 'Q6. What is Gradenigo syndrome? (RGUHS 3M)', 'Q7. What is Bell\'s palsy? Describe ophthalmic complications and management. (RGUHS 5M, 2022)', 'Q8. What is Bell\'s phenomenon? What is its clinical significance? (RGUHS 2M)', 'Q9. Ramsay Hunt syndrome — describe. (RS Singi Yatiraj)', ])) story.append(PageBreak()) # ── CHAPTER 8: NYSTAGMUS ──────────────────────────────────────────── story.append(chapter_banner('CHAPTER 8 — NYSTAGMUS')) story.append(sp(0.5)) story.append(Paragraph('Definition & Classification', h1)) story.append(Paragraph( 'Nystagmus = rhythmic involuntary oscillation of the eyes. ' 'Initiated by involuntary defoveating drift, followed by refixating saccade.', body)) story.append(sp(0.3)) story.append(Paragraph('Types by Wave Form', h2)) story.append(Paragraph('■ <b>Jerk nystagmus</b>: slow drift + fast corrective saccade. Named by direction of fast phase.', bullet)) story.append(Paragraph('■ <b>Pendular nystagmus</b>: equal velocity in both directions (slow phase = slow phase). E.g. in visual deprivation, spasmus nutans.', bullet)) story.append(Paragraph('■ <b>Mixed</b>: pendular in primary, jerk on lateral gaze.', bullet)) story.append(sp(0.3)) story.append(Paragraph('Important Nystagmus Types', h2)) nyst = [ ['Type', 'Direction', 'Lesion/Cause', 'Key Feature'], ['End-point nystagmus', 'Horizontal jerk, fast phase toward gaze', 'Physiological (extreme gaze)', 'Normal finding'], ['Optokinetic nystagmus (OKN)', 'Jerk (slow pursuit + fast saccade)', 'Physiological (moving objects)', 'Tests pursuit (parieto-occipital) and saccade (frontal lobe)'], ['Vestibular nystagmus', 'Horizontal ± torsional jerk', 'Peripheral: labyrinthine; Central: brainstem/cerebellum', 'Peripheral: inhibited by fixation, fatigue with Dix-Hallpike; Central: does not fatigue'], ['Downbeat nystagmus', 'Fast phase downward', 'Craniovertebral junction (Arnold-Chiari, MS, Wernicke\'s)', 'Worse on downgaze; classic: Chiari malformation'], ['Upbeat nystagmus', 'Fast phase upward', 'Anterior vermis lesion, brainstem', 'Medullary or pontine lesion'], ['Ataxic (INO) nystagmus', 'Abducting eye nystagmus only', 'MLF lesion (MS, brainstem infarct)', 'Internuclear ophthalmoplegia (INO); adducting eye limited'], ['See-saw nystagmus', 'One eye rises and intorts; other falls and extorts', 'Parachiasmal lesion (chiasmal tumour, large pituitary adenoma)', 'Pendular; associated with bitemporal hemianopia'], ['Periodic alternating nystagmus (PAN)', 'Jerk, reverses direction every 90–120 seconds', 'Spinocerebellar degeneration, MS, post-meningitis', 'Baclofen responsive'], ['Infantile nystagmus', 'Horizontal, conjugate; uniplanar', 'Idiopathic or albinism, aniridia, achromatopsia', 'Dampened with convergence; null point; head posture'], ['Latent nystagmus', 'Jerk toward fixating eye', 'Congenital; associated infantile esotropia', 'Only appears when one eye covered'], ['Bruns nystagmus', 'Coarse slow nystagmus toward lesion; fine fast toward opposite side', 'CPA (cerebellopontine angle) tumour (acoustic neuroma)', 'Pathognomonic of CPA mass'], ] story.append(three_col_table(['Type', 'Cause/Direction', 'Key Feature'], [[r[0], r[2]+'\nDir: '+r[1], r[3]] for r in nyst[1:]], widths=[42*mm, 72*mm, 60*mm])) story.append(sp(0.3)) story.append(Paragraph('Internuclear Ophthalmoplegia (INO)', h2)) story.append(Paragraph( 'Lesion of <b>medial longitudinal fasciculus (MLF)</b>. ' 'MLF connects PPRF (abducens nucleus/paramedian pontine reticular formation) to the ' 'contralateral CN III nucleus for conjugate horizontal gaze.', body)) story.append(Paragraph('■ IPSILATERAL adduction palsy (CN III appears intact to other stimuli)', bullet)) story.append(Paragraph('■ CONTRALATERAL abducting eye nystagmus (ataxic nystagmus)', bullet)) story.append(Paragraph('■ Convergence intact (post-nuclear fibres not involved)', bullet)) story.append(Paragraph('■ Common cause in young = <b>Multiple Sclerosis</b>; elderly = brainstem infarct', bullet)) story.append(Paragraph('■ <b>WEBINO</b>: Wall-Eyed Bilateral INO = both eyes deviated outward (bilateral MLF)', bullet)) story.append(Paragraph('■ <b>1½ syndrome</b>: PPRF + MLF lesion = ipsilateral gaze palsy + INO; only contralateral abduction preserved', bullet)) story.append(sp(0.3)) story.append(mnemonic_box('INO', '"ADDUCT fails on the SIDE of the MLF lesion" — I: Ipsilateral adduction failure; C: Contralateral abducting nystagmus')) story.append(sp(0.3)) story.append(exam_box([ 'Q1. Classify nystagmus with causes and clinical features. (RGUHS 10M, 2020)', 'Q2. What is downbeat nystagmus? What are its causes? (RGUHS 5M)', 'Q3. Describe internuclear ophthalmoplegia (INO). What is 1½ syndrome? (RGUHS 5M, RS Singi Yatiraj)', 'Q4. What is see-saw nystagmus? What lesion causes it? (RS Singi Yatiraj)', 'Q5. Physiological vs pathological nystagmus. (RGUHS 5M)', 'Q6. Describe Bruns nystagmus and its significance. (RS Singi Yatiraj)', 'Q7. What is the management of infantile nystagmus? (RGUHS 3M)', ])) story.append(PageBreak()) # ── CHAPTER 9: HEREDITARY OPTIC NEUROPATHIES ──────────────────────── story.append(chapter_banner('CHAPTER 9 — HEREDITARY OPTIC NEUROPATHIES & SPECIAL TOPICS', GREEN)) story.append(sp(0.5)) story.append(Paragraph('Leber Hereditary Optic Neuropathy (LHON)', h1)) story.append(Paragraph('■ Mitochondrial inheritance (maternal); males affected more severely', bullet)) story.append(Paragraph('■ Mutations: <b>mt-DNA point mutations</b> — 3 primary: G11778A (most common 70%), G3460A, T14484C', bullet)) story.append(Paragraph('■ Presentation: young males 15–35 yrs; acute/subacute painless central vision loss, one eye then other (weeks-months)', bullet)) story.append(Paragraph('■ Disc: circumpapillary telangiectatic microangiopathy; peripapillary nerve fibre layer swelling (pseudo-oedema); NO leakage on FA (important!)', bullet)) story.append(Paragraph('■ Central scotoma, dyschromatopsia', bullet)) story.append(Paragraph('■ Treatment: Idebenone (antioxidant, EMA approved). Gene therapy under investigation.', bullet)) story.append(sp(0.3)) story.append(Paragraph('Dominant Optic Atrophy (Kjer Disease)', h2)) story.append(Paragraph('■ <b>OPA1 gene mutation</b>, chromosome 3; autosomal dominant', bullet)) story.append(Paragraph('■ Most common hereditary optic neuropathy; incidence 1:50,000', bullet)) story.append(Paragraph('■ Insidious onset in childhood; bitemporal pallor; central/paracentral scotoma; tritanopia (blue-yellow dyschromatopsia)', bullet)) story.append(Paragraph('■ 20% sensorineural hearing loss (Kjer-SNHL)', bullet)) story.append(sp(0.3)) story.append(Paragraph('Wolfram Syndrome (DIDMOAD)', h2)) story.append(Paragraph('DIDMOAD: <b>D</b>iabetes <b>I</b>nsipidus, <b>D</b>iabetes <b>M</b>ellitus, <b>O</b>ptic <b>A</b>trophy, <b>D</b>eafness', bullet)) story.append(Paragraph('■ AR; WFS1 gene mutation; optic atrophy severe, poor prognosis (<6/60)', bullet)) story.append(sp(0.3)) story.append(Paragraph('Toxic & Nutritional Optic Neuropathies', h1)) tox = [ ['Agent', 'Features', 'Notes'], ['Ethambutol', 'Bilateral progressive visual loss, dyschromatopsia, central scotoma', 'Dose-dependent; >25 mg/kg/day; reversible if stopped early; screen at baseline and monthly'], ['Methanol (wood alcohol)', 'Sudden bilateral blindness after latent period; disc hyperaemia then pallor', 'Metabolite formic acid damages mitochondria; treat with ethanol/fomepizole + folinic acid'], ['Tobacco-alcohol amblyopia', 'Bilateral central/cecocentral scotoma; dyschromatopsia', 'Cyanide from tobacco + B12/folate deficiency; improve with hydroxycobalamin + B12'], ['Chloroquine/Hydroxychloroquine', '"Bull\'s eye maculopathy" primarily; rare optic neuropathy', 'Baseline and annual OCT/HVF screening'], ['Amiodarone', 'Non-arteritic ION picture; bilateral', 'Slow onset; may progress even after stopping'], ['B12 / Folate deficiency', 'Bilateral cecocentral scotoma; pallor eventually', 'Part of subacute combined degeneration picture'], ] story.append(three_col_table(['Agent', 'Features', 'Notes'], tox[1:], widths=[40*mm, 74*mm, 60*mm])) story.append(sp(0.3)) story.append(exam_box([ 'Q1. What is LHON? Describe its clinical features and inheritance. (RGUHS 5M, RS Singi Yatiraj)', 'Q2. Describe toxic optic neuropathy due to ethambutol. (RGUHS 5M)', 'Q3. What is Wolfram syndrome (DIDMOAD)? (RGUHS 3M, RS Singi Yatiraj)', 'Q4. What is methanol-induced optic neuropathy? How is it treated? (RGUHS 5M)', ])) story.append(PageBreak()) # ── CHAPTER 10: QUICK REVISION & HIGH-YIELD TABLES ────────────────── story.append(chapter_banner('CHAPTER 10 — RAPID REVISION & HIGH-YIELD FACTS', ACCENT)) story.append(sp(0.5)) story.append(Paragraph('One-Liner High-Yield Facts', h1)) oneliners = [ '• MOST common cause of optic neuritis: Multiple Sclerosis / demyelination', '• MOST common cause of bilateral disc swelling: Raised ICP', '• MOST common cause of raised ICP in young obese women: IIH', '• MOST specific symptom of GCA: Jaw claudication', '• MOST common cause of 4th nerve palsy: Trauma (50%)', '• MOST common cause of 6th nerve palsy in children: Viral (post-infectious)', '• FALSE localising sign: 6th nerve palsy in raised ICP', '• ONLY CN that exits dorsally: CN IV (Trochlear)', '• ONLY CN to decussate TWICE: CN IV', '• Pupil-sparing 3rd nerve palsy: Medical (ischaemic) — DM, HTN', '• Pupil-involving 3rd nerve palsy: EMERGENCY — PComm aneurysm', '• "Prostitute pupil": Argyll Robertson (accommodates but does not react)', '• VEP abnormality persists even after visual recovery: Optic neuritis/MS', '• First line drug in IIH: Acetazolamide', '• ONSF preferred when: Vision-threatening papilloedema, IIH', '• Macular sparing: Occipital cortex lesion (PCA infarct)', '• Macular splitting: Traumatic occipital or radiation lesion', '• Bitemporal hemianopia: Chiasmal lesion (pituitary adenoma most common)', '• Incongruous hemianopia: Optic tract lesion', '• Most congruous hemianopia: Occipital cortex', '• Pie in the sky: Temporal lobe (Meyer\'s loop)', '• Pie on the floor: Parietal lobe', '• DIDMOAD: Wolfram syndrome (DI + DM + Optic Atrophy + Deafness)', '• Bow-tie atrophy: Chiasmal or tract lesion (nasal fibre involvement)', '• Bruns nystagmus: CPA tumour (acoustic neuroma)', '• Downbeat nystagmus: Craniovertebral junction / Chiari malformation', '• See-saw nystagmus: Parachiasmal lesion', '• INO cause in young: MS; in elderly: Brainstem infarct', '• 1½ syndrome: PPRF + MLF lesion on same side', '• Ramsay Hunt syndrome: HZV reactivation at geniculate ganglion', '• Corneal reflex: Afferent V1; Efferent VII', '• LHON mutation: G11778A most common (70%) — mitochondrial', '• Oral steroids contraindicated alone in optic neuritis (ONTT finding)', '• Hydroxyamphetamine differentiates 3rd order Horner from 1st/2nd order', '• TAB remains positive 2–6 weeks after starting steroids for GCA', ] for line in oneliners: story.append(Paragraph(line, bullet)) story.append(sp(0.5)) story.append(Paragraph('Comparison Summary Table', h1)) comp = [ ['Topic', 'Type A', 'Type B'], ['Optic neuritis vs papilloedema', 'Unilateral, RAPD+, central scotoma, pain, VA reduced', 'Bilateral, RAPD-, enlarged blind spot, TVOs, VA normal early'], ['Primary vs Secondary optic atrophy', 'White flat disc, normal cup, well-defined margins', 'Grey disc, blurred margins, obliterated cup'], ['NAION vs AAION', 'Age >50, ESR normal, disc-at-risk, altitudinal defect', 'Age >70, ESR↑, chalky-white disc, GCA systemic signs'], ['Horner vs Adie', 'Miosis, ptosis (mild), anhidrosis; pharmacology: cocaine', 'Mydriasis, tonic near, vermiform iris; pilocarpine 0.1%'], ['CN III surgical vs medical', 'Pupil dilated, painful, acute emergency (aneurysm)', 'Pupil spared, diabetic/hypertensive, self-limiting'], ['WOOG vs BOOT (Parks test)', 'Worse On Opposite Gaze = SO weakness (vertical deviation increases in contralateral gaze)', 'Better On Opposite Tilt = SO palsy (BHTT positive ipsilateral)'], ['INO vs Gaze palsy', 'INO: adduction fails ipsilateral, nystagmus contralateral; convergence OK', 'Gaze palsy: both eyes fail to move to one side'], ['UMN vs LMN facial palsy', 'UMN: lower face only (forehead spared)', 'LMN: entire ipsilateral face + forehead'], ] story.append(three_col_table(['Comparison', 'Type A', 'Type B'], comp[1:], widths=[48*mm, 63*mm, 63*mm])) story.append(sp(0.5)) story.append(Paragraph('Must-Know Syndromes', h2)) synd = [ ['Syndrome', 'Components', 'Lesion'], ['Weber', 'CN III palsy + contralateral hemiplegia', 'Cerebral peduncle'], ['Benedikt', 'CN III palsy + contralateral tremor/extrapyramidal', 'Red nucleus (midbrain)'], ['Nothnagel', 'CN III palsy + ipsilateral cerebellar ataxia', 'Superior cerebellar peduncle'], ['Claude', 'Benedikt + Nothnagel', 'Red nucleus + cerebellar peduncle'], ['Foville (pontine)', 'Ipsilateral CN VI + VII + horizontal gaze palsy + contralateral hemiplegia', 'Pons (tegmentum)'], ['Millard-Gubler', 'CN VI + VII palsy + contralateral hemiplegia', 'Pons (basis)'], ['Foster Kennedy', 'Ipsilateral optic atrophy + contralateral papilloedema', 'Frontal/olfactory groove SOL'], ['Gradenigo', 'CN V + VI + ear pain (petrositis)', 'Petrous apex (otitis media complication)'], ['Parinaud', 'Upgaze palsy, light-near dissociation, convergence-retraction nystagmus, lid retraction (Collier\'s sign)', 'Dorsal midbrain (pinealoma, hydrocephalus)'], ['Holmes-Adie', 'Tonic pupil + absent deep tendon reflexes (ankle)', 'Ciliary ganglion + dorsal root ganglion'], ['Ross', 'Adie + absent DTR + anhidrosis', 'Extensive autonomic denervation'], ['Ramsay Hunt', 'Facial palsy + ear pain + vesicles (ear canal, face)', 'HZV geniculate ganglion'], ] story.append(three_col_table(['Syndrome', 'Components', 'Lesion'], synd[1:], widths=[40*mm, 88*mm, 46*mm])) story.append(PageBreak()) # ── CHAPTER 11: LEBER / CONGENITAL / MISC ─────────────────────────── story.append(chapter_banner('CHAPTER 11 — NEURORETINITIS, CONGENITAL DISC ANOMALIES & MISC', TEAL)) story.append(sp(0.5)) story.append(Paragraph('Neuroretinitis', h1)) story.append(Paragraph( 'Inflammation of the optic disc and superficial retina resulting in optic disc oedema and ' 'macular star (exudates in a star pattern from disc). ' 'NOT typically associated with MS. Causes: Bartonella henselae (cat scratch disease), ' 'syphilis, Lyme disease, leptospirosis, viral.', body)) story.append(Paragraph('■ Treatment of underlying cause; excellent visual prognosis', bullet)) story.append(sp(0.3)) story.append(Paragraph('Congenital Optic Disc Anomalies', h2)) story.append(Paragraph('■ <b>Optic disc pit</b>: grey/yellow depression at disc margin; temporal pit → serous macular detachment', bullet)) story.append(Paragraph('■ <b>Morning glory disc</b>: funnel-shaped disc with central white tuft, dilated vessels, peripapillary retinal pigment; associated with basal encephalocele and carotid artery anomalies', bullet)) story.append(Paragraph('■ <b>Tilted disc syndrome</b>: situs inversus of vessels; bitemporal visual field defect (NOT crossing vertical midline) → does not respect vertical midline = congenital, not chiasmal', bullet)) story.append(Paragraph('■ <b>Optic disc coloboma</b>: excavated disc at 6 o\'clock; associated with CHARGE syndrome, morning glory', bullet)) story.append(Paragraph('■ <b>Hypoplastic disc</b>: small disc; double ring sign; septo-optic dysplasia (de Morsier syndrome) = optic nerve hypoplasia + absent septum pellucidum + pituitary dysfunction', bullet)) story.append(Paragraph('■ <b>Myelinated nerve fibres</b>: white feathery streaks at disc border; benign but can cause myopia and amblyopia', bullet)) story.append(Paragraph('■ <b>Drusen of optic disc</b>: calcified deposits; pseudopapilloedema; anomalous autofluorescence on FAF', bullet)) story.append(sp(0.3)) story.append(Paragraph('Parinaud (Dorsal Midbrain) Syndrome', h1)) story.append(Paragraph('Classic triad: (1) <b>Upgaze palsy</b>, (2) <b>Light-near dissociation</b>, (3) <b>Convergence-retraction nystagmus</b>', body)) story.append(Paragraph('■ Additional: lid retraction (Collier\'s sign = "setting sun" sign in hydrocephalus in neonates)', bullet)) story.append(Paragraph('■ <b>Causes</b>: pinealoma (young males), hydrocephalus (aqueduct compression), midbrain infarct, MS, vascular malformation', bullet)) story.append(Paragraph('■ Mechanism: compression of posterior commissure fibres (upgrade gaze = innervated from rostral interstitial nucleus, riMLF)', bullet)) story.append(sp(0.3)) story.append(exam_box([ 'Q1. What is Parinaud syndrome? Give its causes, features and mechanism. (RGUHS 5M, RS Singi Yatiraj)', 'Q2. What is neuroretinitis? How does it differ from papillitis? (RGUHS 5M)', 'Q3. What is morning glory disc? What are its associations? (RS Singi Yatiraj)', 'Q4. What is de Morsier syndrome? (RS Singi Yatiraj)', 'Q5. What is optic disc drusen? How is it differentiated from papilloedema? (RGUHS 3M)', 'Q6. Tilted disc syndrome and its visual field changes. (RS Singi Yatiraj)', ])) story.append(sp(0.5)) # FINAL QUICK REFERENCE story.append(chapter_banner('RAPID REVIEW — DRUG CHART FOR NEURO-OPHTHALMOLOGY EXAMS', ACCENT)) story.append(sp(0.3)) drugs = [ ['Drug / Agent', 'Use in Neuro-Ophth', 'Mechanism'], ['Acetazolamide', 'IIH (first-line)', 'Carbonic anhydrase inhibitor → ↓ CSF production'], ['IV Methylprednisolone', 'Optic neuritis (speeds recovery), GCA (first-line emergency)', 'Corticosteroid → ↓ inflammation'], ['Oral prednisolone', 'GCA maintenance; IIH (short-term); AVOID alone in optic neuritis', 'Corticosteroid'], ['Topiramate', 'IIH (2nd line, aids weight loss)', 'Carbonic anhydrase inhibitor + weight loss'], ['Baclofen', 'Periodic alternating nystagmus (PAN)', 'GABA-B agonist → stabilises gaze'], ['Idebenone', 'LHON treatment', 'Antioxidant; bypasses complex I defect'], ['Eculizumab/Inebilizumab/Satralizumab', 'NMOSD (AQP4+)', 'Anti-complement / anti-CD19 / anti-IL-6R'], ['Hydroxyamphetamine 1%', 'Differentiates 3rd order Horner', 'Releases NA from postganglionic terminal'], ['Cocaine 4–10%', 'Confirms Horner syndrome (any level)', 'Blocks NA reuptake → no dilation in Horner'], ['Apraclonidine 0.5%', 'Confirms Horner syndrome', 'Alpha-2 agonist; reversal of anisocoria'], ['Pilocarpine 0.1%', 'Confirms Adie pupil (supersensitivity)', 'Cholinomimetic → tonic pupil constricts dramatically'], ['Pilocarpine 1%', 'Differentiates pharmacological mydriasis', 'Fails to constrict drug-dilated pupil'], ['Ethambutol (toxic)', 'Causes toxic optic neuropathy', 'Chelates copper → optic nerve damage'], ['Hydroxycobalamin', 'Tobacco-alcohol amblyopia; B12 deficiency OA', 'Detoxifies cyanide; replenishes B12'], ['Fomepizole/Ethanol', 'Methanol poisoning', 'Alcohol dehydrogenase inhibitor'], ] story.append(three_col_table(['Drug / Agent', 'Use in Neuro-Ophthalmology', 'Mechanism'], drugs[1:], widths=[50*mm, 72*mm, 52*mm])) story.append(sp(1)) # footer note story.append(Paragraph( '<i>These notes are based on Kanski\'s Clinical Ophthalmology (10th Ed.), Bradley &amp; Daroff\'s Neurology, ' 'Goldman-Cecil Medicine, and aligned with RGUHS MBBS examination patterns and RS Singi Yatiraj Solved Question Bank. ' 'Always cross-reference with current curriculum and clinical guidelines.</i>', S('Footer', fontSize=7.5, textColor=MGRAY, fontName='Helvetica-Oblique', alignment=TA_CENTER, leading=11))) # ── BUILD ───────────────────────────────────────────────────────────── doc.build(story) print("PDF generated successfully!") PYEOF

mkdir -p /home/daytona/workspace/neuro-ophthal && echo "dir ready"

mkdir -p /home/daytona/workspace/neuro-ophthal && python3 -c "from reportlab.lib.pagesizes import A4; print('reportlab OK')"