This is my patient s case history So now you prepare How to describe history points Examination every point step by step Then diffrential Diagnosis According to standard practical books like pg clinic by dr prafulla and dr pk mukherjee And kanski And every word by decribing which question examiner can ask what are possible answer and how to describe Every thing is very very detail and acurate Extra point theory if you want to add add that too

Reading File

Browsing Directory

Reading File

Running Command

mkdir -p "/tmp/workspace/ags-case/src" "/tmp/workspace/ags-case/output" && python -c "import pdfplumber; p='/tmp/workspace/attachments/c18e0d75-d5d0-4f3c-a3e5-e07b8d6895c6/AGS.pdf'; pdf=pdfplumber.open(p); print('PAGES',len(pdf.pages)); out='\\n\\n'.join('--- PAGE %d ---\\n%s'%(i+1,(page.extract_text() or '')) for i,page in enumerate(pdf.pages)); open('/tmp/workspace/ags-case/src/extracted.txt','w',encoding='utf-8').write(out); print(out[:12000])"

Running Command

python -c "import fitz; d=fitz.open('/tmp/workspace/attachments/c18e0d75-d5d0-4f3c-a3e5-e07b8d6895c6/AGS.pdf'); [p.get_pixmap(matrix=fitz.Matrix(2,2),alpha=False).save(f'/tmp/workspace/ags-case/src/page_{i+1}.png') for i,p in enumerate(d)]"

Running Command

python -c "import pypdfium2 as pdfium; p=pdfium.PdfDocument('/tmp/workspace/attachments/c18e0d75-d5d0-4f3c-a3e5-e07b8d6895c6/AGS.pdf'); print(len(p)); [p[i].render(scale=2.5).to_pil().save(f'/tmp/workspace/ags-case/src/page_{i+1}.png') for i in range(len(p))]"

Reading File

Running Command

python -c "from PIL import Image; [Image.open(f'/tmp/workspace/ags-case/src/page_{i}.png').resize((600,848)).save(f'/tmp/workspace/ags-case/src/preview_{i}.jpg',quality=70,optimize=True) for i in range(1,4)]"

Reading File

Searching the Web

Kanski Clinical Ophthalmology acute angle closure glaucoma examination history differential diagnosis

Searching PubMed

acute angle closure glaucoma AND diagnosis

Finding Sources

Running Command

python -c "import pytesseract; from PIL import Image; [print('---PAGE',i,'---\\n',pytesseract.image_to_string(Image.open(f'/tmp/workspace/ags-case/src/page_{i}.png'))) for i in range(1,4)]"

Running Command

python -c "from PIL import Image,ImageStat; [print(i,Image.open(f'/tmp/workspace/ags-case/src/page_{i}.png').size,ImageStat.Stat(Image.open(f'/tmp/workspace/ags-case/src/page_{i}.png')).mean) for i in range(1,4)]" && python -m pip install --user rapidocr_onnxruntime -q

Running Command

python -c "from PIL import Image; [Image.open(f'/tmp/workspace/ags-case/src/page_{i}.png').resize((320,480)).convert('L').save(f'/tmp/workspace/ags-case/src/tiny_{i}.jpg',quality=45,optimize=True) for i in range(1,4)]"

Reading File

Finding Sources

Reading Web Page

https://www.aao.org/education/current-insight/angleclosure-g…

Running Command

python -c "from pypdf import PdfReader; r=PdfReader('/tmp/workspace/attachments/c18e0d75-d5d0-4f3c-a3e5-e07b8d6895c6/AGS.pdf'); print([(i+1,len(p.images)) for i,p in enumerate(r.pages)]); [open(f'/tmp/workspace/ags-case/src/img_{i+1}_{j+1}.{im.name.split(\".\")[-1]}','wb').write(im.data) for i,p in enumerate(r.pages) for j,im in enumerate(p.images)]" && ls -lh "/tmp/workspace/ags-case/src"

Running Command

python -c "import importlib.util; print('easyocr',importlib.util.find_spec('easyocr')); print('rapidocr',importlib.util.find_spec('rapidocr_onnxruntime')); print('keras_ocr',importlib.util.find_spec('keras_ocr')); print('cv2',importlib.util.find_spec('cv2'))"

Running Command

python -m pip install --target "/tmp/workspace/ags-case/src/ocr_lib" rapidocr_onnxruntime -q && PYTHONPATH="/tmp/workspace/ags-case/src/ocr_lib" python -c "from rapidocr_onnxruntime import RapidOCR; o=RapidOCR(); import glob; [print('---',p,'---'); print('\\n'.join(x[1] for x in o(p)[0])) for p in glob.glob('/tmp/workspace/ags-case/src/img_*.jpg')]"

Running Command

PYTHONPATH="/tmp/workspace/ags-case/src/ocr_lib" python -c "from rapidocr_onnxruntime import RapidOCR; import glob; o=RapidOCR(); r=[(p,o(p)[0]) for p in glob.glob('/tmp/workspace/ags-case/src/img_*.jpg')]; open('/tmp/workspace/ags-case/src/ocr.txt','w').write('\\n\\n'.join('---'+p+'---\\n'+'\\n'.join(x[1] for x in q) for p,q in r))"

Reading File

The uploaded case sheet is a handwritten scan, and some entries are not reliably legible. I can make out “AGS LE”, which likely means acute glaucoma syndrome in the left eye, but I should not invent patient-specific findings such as visual acuity, IOP, pupil size, or gonioscopy results from an unclear scan.

If this is indeed acute angle-closure glaucoma of the left eye, it is an ophthalmic emergency. The expected core picture is a painful red eye, sudden reduction of vision with haloes, headache, nausea/vomiting, corneal edema, shallow anterior chamber, a mid-dilated poorly reacting pupil, raised IOP, and angle closure on gonioscopy. This matches the diagnostic framework described by the American Academy of Ophthalmology.

How I will structure the complete practical-case preparation

Case-sheet decoding and case presentation
- Convert the handwritten sheet into a clean, correct long-case history.
- Identify what is present, absent, and what must not be claimed.
- One-minute, three-minute, and detailed presentation formats.
History taking for acute glaucoma
- Every question to ask in sequence.
- Why each question matters.
- Expected answers in acute angle closure.
- Examiner cross-questions and model answers.
- Negative history that rules out mimics and secondary glaucoma.
Step-by-step ocular examination
- General examination.
- Visual acuity, pupils, torchlight exam, palpation, slit-lamp examination.
- Anterior chamber depth assessment including Van Herick method.
- IOP measurement and interpretation.
- Gonioscopy, fundus examination, fellow-eye examination.
- Exact wording to speak during practical examination.
Finding-wise interpretation
- Why the eye is red.
- Why corneal edema occurs.
- Why the pupil is vertically oval or mid-dilated and fixed.
- Why the anterior chamber becomes shallow.
- Why vomiting occurs.
- Meaning of glaucomflecken, iris atrophy, peripheral anterior synechiae, and optic-disc changes.
Differential diagnosis
- Acute angle-closure glaucoma.
- Acute anterior uveitis/iridocyclitis.
- Acute conjunctivitis.
- Keratitis/corneal ulcer.
- Endophthalmitis.
- Scleritis.
- Secondary angle closure, including lens-induced, uveitic, neovascular, drug-induced, and malignant glaucoma.
- Table of differentiating clinical points and viva questions.
Diagnosis and classification
- How to state the diagnosis precisely.
- Primary angle-closure suspect, primary angle closure, primary angle-closure glaucoma, acute angle-closure attack, chronic angle closure.
- Mechanisms: pupillary block and non-pupillary-block mechanisms.
- How to distinguish a first attack from previous/subacute attacks.
Investigations and immediate management
- Essential investigations and their timing.
- Emergency pressure-lowering treatment.
- Definitive treatment and fellow-eye prophylaxis.
- Contraindications and common viva traps.
- Follow-up and complications.
Full examiner viva bank
- Short questions, long questions, counter-questions, and model answers.
- Important Kanski-based theory points.
- Practical-book style presentation language.

Short clinical summary for the likely case

Provisional diagnosis:
“Acute angle-closure glaucoma, left eye, pending confirmation by IOP measurement, slit-lamp assessment of anterior chamber depth, and gonioscopy. The fellow eye must be assessed for a narrow/occludable angle.”

Why this diagnosis is likely:
Angle closure is obstruction of aqueous outflow when peripheral iris contacts and occludes the trabecular meshwork. Kanski describes the central importance of gonioscopy in evaluating the degree of closure and future risk. A typical acute episode causes an abrupt major rise in IOP, producing pain, blurred vision, haloes, corneal edema, ciliary congestion, shallow anterior chamber, and a mid-dilated poorly reactive pupil.

Important examination sequence in the patient:

Examine both eyes together before touching the eye.
Record unaided and best-corrected visual acuity.
Inspect lids, conjunctiva, pattern of congestion, corneal clarity, pupil size/shape/reactivity.
Compare anterior chamber depth in both eyes using oblique torch illumination.
Perform slit-lamp examination.
Measure IOP by applanation tonometry if feasible.
Perform gonioscopy after initial stabilization, or cautiously when clinically appropriate.
Examine the optic disc once media clarity permits.
Examine the fellow eye carefully, because it commonly has the same anatomical predisposition.

Key diagnostic confirmation:
A high IOP, shallow anterior chamber, corneal edema, mid-dilated fixed pupil, and closed angle on gonioscopy strongly support acute angle closure. The AAO description notes a typical diagnostic combination of symptoms plus raised IOP and signs such as conjunctival injection, epithelial corneal edema, shallow chamber, and a nonreactive mid-dilated pupil.

Important immediate safety point:
If the patient is currently symptomatic with a painful red eye, reduced vision, headache, nausea, or vomiting, this requires same-day emergency ophthalmology assessment. Do not delay urgent pressure-lowering treatment while completing a long examination or case discussion.

I can prepare the next response as a detailed practical manual, but the full request is too extensive to deliver accurately in one message. Reply with “history”, “examination”, “differential”, “diagnosis”, “management”, “viva”, or “continue” to go deeper with a fresh budget.

Give the step-by-step ocular examination with examiner questions

Reading File

Finding Sources

Searching PubMed

acute angle closure glaucoma

Searching the Web

American Academy Ophthalmology acute angle closure glaucoma clinical examination gonioscopy

Step-by-step ocular examination for suspected acute angle-closure glaucoma

Use this as a practical examination script. Do not claim a sign unless you have seen it. In your final presentation, replace bracketed fields with the actual finding.

Important: In a patient with a painful red eye and suspected acute angle closure, do the basic examination quickly and arrange immediate IOP-lowering treatment. Do not delay care for prolonged examination, routine dilation, visual-field testing, or detailed fundus examination.

1. Preparation and general approach

What you do

Wash hands.
Introduce yourself and confirm identity.
Explain: “I will examine both eyes. I will first look at the eyes without touching them, then check vision and pressure.”
Ensure adequate illumination.
Examine both eyes side by side.
Ask the patient to remove spectacles, but keep their habitual glasses available for refraction history.
Begin with the unaffected eye, if one eye is acutely painful.
Do not instil mydriatics in suspected acute angle closure.

What you say to the examiner

“I will examine both eyes systematically, beginning with visual function, followed by external examination, anterior-segment examination, pupillary reactions, anterior chamber depth, intraocular pressure, gonioscopy when safe, and posterior-segment examination. I will examine the fellow eye carefully because it may have an anatomically narrow, occludable angle.”

Examiner questions

Q. Why examine the fellow eye?
Answer:
Primary angle closure usually occurs in an anatomically predisposed eye, with features such as short axial length, hypermetropia, shallow anterior chamber, thicker or anteriorly positioned lens, and narrow angle. The fellow eye often has similar anatomy and is at risk of a similar attack. Gonioscopy of both eyes is important, and prophylactic laser peripheral iridotomy may be indicated in the fellow eye depending on findings.

Q. Why should you not dilate the pupil initially?
Answer:
Pupil dilatation can worsen pupillary-block angle closure by increasing iris-lens contact and causing peripheral iris crowding. Fundus examination should be attempted without dilatation after IOP control, unless a glaucoma specialist decides otherwise.

2. Visual acuity

What you do

Test unaided distant visual acuity in each eye separately using Snellen chart or logMAR chart.
Test the affected eye first only if patient cooperation permits. Otherwise test the unaffected eye first.
Record whether the patient uses spectacles.
If vision is reduced, perform pinhole testing if possible.
Assess near vision after distant visual acuity, if clinically feasible.

What you say

“Visual acuity in the right eye is [6/6, 6/9, etc.] and in the left eye is [record actual acuity]. In the affected left eye, visual acuity is reduced and does not improve significantly with pinhole, suggesting that the reduction is not simply due to refractive error.”

Expected finding in acute angle closure

Vision is commonly reduced because of:
- Corneal epithelial edema
- Increased IOP
- Optical disturbance due to corneal haze
- In severe or prolonged cases, optic-nerve dysfunction

Examiner questions

Q. Why is visual acuity reduced in acute angle closure?
Answer:
The very high IOP causes corneal endothelial dysfunction and epithelial edema. This produces corneal haze and haloes around lights, reducing visual acuity. Severe pressure elevation may also compromise optic-nerve function.

Q. Why may pinhole not improve vision?
Answer:
Pinhole improves vision primarily in refractive error. In acute angle closure, reduced vision is commonly due to corneal edema and media opacity, not uncorrected refractive error.

Q. What is the significance of haloes around lights?
Answer:
Haloes occur because corneal edema causes diffraction and scattering of light. Coloured haloes in a painful red eye with blurred vision should raise suspicion of acute angle closure.

3. Inspection from a distance

What you do

Observe the patient before touching the eye:

Is the patient distressed?
Is there photophobia?
Is the eye kept closed due to pain?
Is there watering?
Is there blepharospasm?
Is there redness?
Is there lid edema?
Does the patient look nauseated or vomit?

What you say

“The patient appears [distressed/uncomfortable]. The left eye shows [watering/blepharospasm/redness]. There is no obvious [lid abnormality/proptosis/facial asymmetry], unless present.”

Examiner questions

Q. Why may the patient have nausea and vomiting in acute angle closure?
Answer:
A sudden marked rise in IOP produces severe ocular and trigeminal pain, often associated with autonomic symptoms such as headache, nausea, vomiting, sweating, and malaise. It can mimic an acute abdominal, neurological, or migraine presentation.

Q. What is the practical importance of vomiting?
Answer:
The patient may present to medicine or emergency care rather than ophthalmology. In an older patient with headache, vomiting, and a red eye, acute angle closure must be considered.

4. External ocular examination

Examine the following in both eyes.

A. Eyelids and adnexa

What you look for

Lid edema
Ptosis
Blepharospasm
Discharge
Lacrimation
Skin vesicles, especially herpes zoster ophthalmicus
Proptosis or resistance to retropulsion
Preauricular lymph nodes, if conjunctivitis or viral disease is suspected

What you say

“There is [no/mild] lid edema and [no] purulent discharge. The lacrimation is [present/absent]. There is no vesicular rash in the distribution of the ophthalmic division of the trigeminal nerve.”

Examiner questions

Q. What does purulent discharge suggest?
Answer:
Purulent discharge suggests bacterial conjunctivitis rather than acute angle closure. Acute angle closure causes watering, but not typically mucopurulent discharge.

Q. Why look for a herpes zoster rash?
Answer:
Herpes zoster ophthalmicus can cause keratitis, uveitis, and secondary glaucoma, including raised IOP with a painful red eye.

B. Conjunctival and ciliary congestion

What you do

Inspect the pattern of redness:

Diffuse superficial conjunctival injection?
Circumcorneal or ciliary congestion?
Sectoral deep violaceous congestion?
Chemosis?
Discharge?

What you say

“The left eye has circumcorneal ciliary congestion, also called ciliary flush, which is more marked around the limbus. There is no significant mucopurulent discharge.”

Expected acute-angle-closure finding

Ciliary flush or circumcorneal congestion
Engorged conjunctival vessels
Sometimes diffuse redness in severe cases

Examiner questions

Q. What is ciliary congestion?
Answer:
Ciliary congestion is deep circumcorneal injection around the limbus caused by congestion of the anterior ciliary vessels. It is seen in deeper ocular inflammation or raised IOP, for example keratitis, anterior uveitis, and acute glaucoma.

Q. How is ciliary congestion different from conjunctival congestion?

Feature	Ciliary congestion	Conjunctival congestion
Site	Maximal around limbus	More prominent in fornices
Vessels	Deep, violaceous, relatively fixed	Superficial, bright red, mobile
Blanching with topical vasoconstrictor	Less marked	More marked
Typical conditions	Keratitis, uveitis, acute glaucoma	Conjunctivitis

Q. Is ciliary congestion specific for acute glaucoma?
Answer:
No. It indicates deeper ocular involvement but may also occur in keratitis, anterior uveitis, and scleritis. Other findings, particularly IOP, anterior chamber depth, corneal edema, pupil, and gonioscopy, distinguish them.

5. Corneal examination

What you do

Use oblique illumination, then slit lamp if available:

Assess corneal clarity.
Look for epithelial microcystic edema.
Look for stromal edema or Descemet membrane folds.
Look for keratic precipitates.
Look for infiltrate, ulcer, fluorescein staining, foreign body, or dendritic lesion.
Assess corneal sensation only if herpes keratitis is a concern, and do so gently.

What you say

“The cornea of the left eye is [hazy/edematous], with [microcystic epithelial edema/Descemet folds if seen]. There is no focal infiltrate, corneal ulcer, fluorescein-staining epithelial defect, or keratic precipitate.”

Expected acute-angle-closure finding

Hazy cornea from epithelial and stromal edema
Fine epithelial microcysts
Descemet folds in more severe pressure elevation

Examiner questions

Q. Why does corneal edema occur in acute angle closure?
Answer:
A marked rise in IOP impairs endothelial pump function. The cornea takes up fluid, first causing epithelial microcysts and later stromal edema and Descemet folds. Corneal edema causes hazy vision and haloes.

Q. How will you differentiate corneal edema of acute glaucoma from keratitis?
Answer:
In acute glaucoma, corneal edema is usually diffuse, with high IOP, shallow anterior chamber, mid-dilated fixed pupil, and ciliary congestion. In keratitis, there is often a focal infiltrate, epithelial defect with fluorescein staining, marked photophobia, and IOP may be normal or low. The pupil is usually not characteristically mid-dilated and fixed.

Q. Why should fluorescein staining be performed in a red eye?
Answer:
It helps detect epithelial defects, corneal ulceration, abrasion, dendritic keratitis, or foreign-body-related damage, which are important differentials of a painful red eye.

6. Anterior chamber depth

This is a high-yield practical step.

A. Oblique torchlight test

What you do

Darken the room slightly.
Shine a narrow beam of light from the temporal side across the iris.
Look for a shadow on the nasal iris.

Interpretation

No iris shadow: anterior chamber likely adequately deep.
Nasal iris shadow: shallow anterior chamber is likely.
A broad nasal shadow suggests marked shallowing.

What you say

“On oblique torchlight examination, there is a marked shadow on the nasal iris of the left eye, suggesting a shallow anterior chamber. The fellow eye should be examined similarly.”

Examiner questions

Q. What is the principle of the oblique torchlight test?
Answer:
In a shallow anterior chamber, the iris lies more anteriorly and blocks light reaching the nasal iris. This produces a crescentic shadow. It is only a screening test, not a substitute for gonioscopy.

Q. Is this test sufficient to diagnose angle closure?
Answer:
No. It suggests a shallow chamber but does not demonstrate angle anatomy or closure. Gonioscopy is the reference clinical examination for angle assessment.

B. Van Herick peripheral anterior chamber depth assessment

What you do

At the slit lamp:

Use a narrow bright slit beam.
Direct it at approximately 60 degrees to the temporal limbus.
Compare the dark peripheral anterior chamber gap with the adjacent corneal thickness.
Perform before gonioscopy.

Van Herick grading

Grade	Peripheral chamber depth compared with corneal thickness	Meaning
4	Equal to or greater than corneal thickness	Wide open angle likely
3	One-half to one corneal thickness	Open angle likely
2	One-quarter corneal thickness	Narrow angle, gonioscopy required
1	Less than one-quarter corneal thickness	Very narrow, high risk of closure
0	No visible gap	Closed angle likely

What you say

“On Van Herick assessment, the peripheral anterior chamber depth in the left eye is approximately [grade]. A grade of 0 or 1 supports a very narrow or closed angle. I would confirm this by careful gonioscopy once the patient is stabilized.”

Examiner questions

Q. Why is Van Herick done temporally?
Answer:
The temporal limbus gives a relatively clear view and is practical for comparing the peripheral chamber depth with corneal thickness. It is a rapid screening assessment.

Q. What is the limitation of Van Herick grading?
Answer:
It assesses peripheral chamber depth indirectly and does not show the angle structures, peripheral anterior synechiae, pigmentation, neovascularization, or exact mechanism of closure. Gonioscopy remains necessary.

Q. Can the central anterior chamber appear formed in angle closure?
Answer:
Yes. Particularly in pupillary-block mechanisms, peripheral shallowing can be more marked than central shallowing due to iris bombe. Therefore, a seemingly formed central chamber does not exclude a narrow or closed angle.

7. Pupil examination

What you do

Inspect size, shape, equality, and position.
Check direct and consensual light reflexes.
Check near response, if possible.
Look for relative afferent pupillary defect only if vision is markedly reduced and the media permit meaningful assessment.
Avoid prolonged bright-light testing if it increases discomfort.

What you say

“The left pupil is [mid-dilated, approximately 4-6 mm], [vertically oval/round], and [sluggish/non-reactive] to light. The right pupil is [normal/reactive].”

Expected acute-angle-closure finding

Mid-dilated pupil
Often vertically oval
Sluggish or fixed reaction to light
May show iris atrophy later

Examiner questions

Q. Why is the pupil mid-dilated and fixed?
Answer:
A very high IOP causes iris sphincter ischemia and paralysis. The iris dilator action may predominate, leaving a mid-dilated poorly reactive pupil. The mid-dilated state also worsens pupillary block because iris-lens contact is greatest in this position.

Q. Why may the pupil be vertically oval?
Answer:
Uneven ischemia of the iris sphincter and irregular pressure effects can produce an oval or distorted pupil.

Q. Is a fixed mid-dilated pupil specific for acute angle closure?
Answer:
No. It is a strong clue in the correct clinical context. It can also occur with pharmacological dilatation, third-nerve palsy, traumatic iris damage, or severe ocular disease. Interpretation requires correlation with IOP, cornea, chamber depth, and gonioscopy.

Q. How does the pupil differ in acute anterior uveitis?
Answer:
In acute anterior uveitis, the pupil is usually small, irregular, and sluggish due to sphincter spasm and posterior synechiae. In acute angle closure, it is classically mid-dilated and poorly reactive.

8. Iris examination

What you look for

At slit lamp, assess:

Iris colour and surface
Atrophy or sectoral iris atrophy
Iris bombe
Posterior synechiae
Neovascularization of iris, especially at pupillary margin
Pseudoexfoliative material
Transillumination defects
Lens-related changes visible through pupil

What you say

“The iris shows [no neovascularization/no posterior synechiae/no iris bombe], unless present. I would specifically exclude rubeosis iridis and signs of uveitis or secondary glaucoma.”

Examiner questions

Q. What is iris bombe?
Answer:
Iris bombe is anterior bowing of the peripheral iris due to 360-degree posterior synechiae causing pupillary block. Aqueous cannot pass from posterior to anterior chamber, accumulates behind the iris, and pushes the peripheral iris forward to close the angle.

Q. In which condition is iris bombe especially important?
Answer:
It is classically associated with uveitis causing seclusio pupillae and secondary pupillary-block angle closure.

Q. What does rubeosis iridis indicate?
Answer:
Rubeosis iridis is abnormal neovascularization of the iris, usually due to retinal ischemia such as proliferative diabetic retinopathy, central retinal vein occlusion, or ocular ischemic syndrome. It may cause neovascular glaucoma and secondary angle closure.

9. Lens examination

What you do

Assess:

Lens clarity
Cataract
Lens thickness or anterior position, as far as can be clinically assessed
Phacodonesis or subluxation
Pseudoexfoliative material
Glaucomflecken

What you say

“The lens shows [clear lens/age-related cataract]. I specifically look for glaucomflecken, which are anterior subcapsular grey-white lens opacities and suggest previous episodes of markedly raised intraocular pressure.”

Examiner questions

Q. What are glaucomflecken?
Answer:
Glaucomflecken are small grey-white anterior subcapsular lens opacities caused by ischemic necrosis of anterior lens epithelial cells after an acute marked rise in IOP. They suggest a prior or prolonged acute angle-closure episode.

Q. What is the role of the lens in primary angle closure?
Answer:
With aging, the lens becomes thicker and may move anteriorly. In an anatomically small eye, this crowds the anterior segment, increases relative pupillary block, and narrows the angle. Lens extraction can therefore be an important definitive treatment in selected angle-closure disease.

Q. Which lens-induced glaucomas can cause angle closure?
Answer:
Phacomorphic glaucoma due to an intumescent cataract causing pupillary block and angle crowding; phacolytic glaucoma is usually open-angle; lens-particle glaucoma follows capsular disruption; and ectopia lentis can cause pupillary block depending on lens displacement.

10. Intraocular pressure assessment

A. Digital palpation

What you do

Ask patient to look down.
Place both index fingers gently on the upper lid over the globe.
Alternately press gently to estimate globe tension.
Compare both eyes.
Do not use force or repeat excessively.

What you say

“Digital palpation suggests that the left globe is markedly firmer than the right. This is only a rough bedside assessment; I will confirm IOP by tonometry.”

Examiner questions

Q. What does a ‘stony hard eye’ mean?
Answer:
It is a traditional clinical description of a globe with grossly raised IOP on digital palpation, often in acute angle closure. It is subjective and must be confirmed by tonometry.

Q. Is digital palpation an accurate method of measuring IOP?
Answer:
No. It is only a rough screening assessment. Goldmann applanation tonometry is the standard clinical method when feasible.

B. Tonometry

What you do

Use Goldmann applanation tonometry after topical anaesthetic and fluorescein, if the patient can cooperate.
If corneal edema is severe or patient cooperation is poor, handheld applanation or rebound tonometry may be necessary.
Record IOP in both eyes, the technique used, and time of measurement.

What you say

“Intraocular pressure measured by [method] is [value] mmHg in the right eye and [value] mmHg in the left eye. The left IOP is markedly elevated.”

Expected acute-angle-closure finding

Often very high, frequently 40-60 mmHg or more.
A normal IOP does not fully exclude intermittent or early angle closure.

Examiner questions

Q. What is the normal range of IOP?
Answer:
Conventionally, approximately 10-21 mmHg. However, glaucoma is not defined only by a numerical IOP threshold. It is an optic neuropathy characterized by retinal ganglion cell loss and characteristic structural and functional damage.

Q. Why should IOP be measured before gonioscopy?
Answer:
Gonioscopy, particularly indentation gonioscopy, can alter aqueous outflow and may transiently change IOP. Baseline IOP should be documented first when possible. Kanski’s standard glaucoma assessment includes tonometry followed by gonioscopy and optic-disc assessment.

Q. Can IOP be falsely high or low?
Answer:
Yes. Corneal thickness, corneal edema, corneal scarring, irregular astigmatism, and biomechanical factors can affect readings. In acute corneal edema, applanation may be less reliable, so clinical correlation is necessary.

Q. Can acute angle closure have a normal IOP?
Answer:
Yes, particularly early in an intermittent episode or after spontaneous partial reopening. If clinical suspicion is high, gonioscopy and repeat assessment are needed.

11. Gonioscopy

This is the decisive examination for angle anatomy.

Safety point

In a patient with severe acute attack, perform gonioscopy gently and only after initial stabilization as appropriate. Avoid excessive pressure. Indentation gonioscopy should be performed by an experienced examiner and may help distinguish appositional closure from synechial closure.

What you do

Explain the procedure.
Instil topical anaesthetic.
Use a gonioscopy lens, ideally a four-mirror lens for dynamic indentation.
Examine all four quadrants in dim illumination.
Avoid a bright light beam and avoid prolonged illumination, as this can cause pupillary constriction and falsely open a narrow angle.
Identify the most posterior angle structure visible.
Note:
- Angle width
- Iridotrabecular contact
- Trabecular meshwork visibility
- Peripheral anterior synechiae
- Pigmentation
- Iris configuration
- Neovascularization
- Recession, if trauma suspected
Perform indentation carefully to differentiate appositional closure from synechial closure.

What you say

“Gonioscopy is required to confirm the diagnosis. In the affected eye, I would expect to find angle closure with failure to visualize the posterior trabecular meshwork due to iridotrabecular contact. I will assess all four quadrants for the extent of closure, peripheral anterior synechiae, pigmentation, and any secondary cause. I will also perform gonioscopy in the fellow eye.”

Examiner questions

Q. Why is gonioscopy essential?
Answer:
The anterior chamber angle cannot be directly visualized because of total internal reflection at the cornea-air interface. Gonioscopy overcomes this optical barrier and establishes whether the angle is open, narrow, appositionally closed, or synechially closed. It is key to diagnosing and classifying angle-closure disease.

Q. What are the normal angle structures, from anterior to posterior?
Answer:
Schwalbe line, trabecular meshwork, scleral spur, ciliary body band, and iris root.

Q. What is meant by iridotrabecular contact?
Answer:
It is contact between peripheral iris and trabecular meshwork. It obstructs aqueous outflow and is the anatomical basis of angle closure.

Q. What are peripheral anterior synechiae?
Answer:
They are permanent adhesions between peripheral iris and the angle structures, usually the trabecular meshwork. They indicate previous or established synechial angle closure and do not open with indentation.

Q. What is the difference between appositional and synechial closure?

Feature	Appositional closure	Synechial closure
Nature	Reversible iris contact	Permanent iris adhesion
Indentation gonioscopy	Angle opens	Angle remains closed at site of PAS
Typical setting	Acute or intermittent angle closure	Chronic or previous angle closure, uveitis, neovascular glaucoma
Management implication	May respond to relieving mechanism	May require IOP treatment beyond iridotomy

Q. What does indentation gonioscopy do?
Answer:
Gentle central corneal pressure displaces aqueous posteriorly and can push peripheral iris backward. If the angle opens, closure is appositional. If focal areas remain closed, peripheral anterior synechiae are likely present.

Q. What is Shaffer grading?

Shaffer grade	Estimated angle width	Risk of closure
4	35-45 degrees	Impossible
3	25-35 degrees	Very unlikely
2	About 20 degrees	Possible
1	About 10 degrees	High
0	Closed	Closed angle

Q. Why perform gonioscopy in a dark room?
Answer:
Bright light causes pupillary constriction and can artificially widen an angle. Dim illumination gives a more physiologically accurate assessment of a narrow angle.

12. Fundus examination and optic-disc assessment

What you do

Attempt undilated direct ophthalmoscopy or slit-lamp biomicroscopy with a suitable lens after initial stabilization.
Assess media clarity.
Examine:
- Disc size
- Cup-disc ratio
- Neuroretinal rim
- ISNT rule
- Disc hemorrhage
- Retinal nerve fiber layer
- Macula
- Retinal vessels
- Any retinal ischemia, diabetic retinopathy, vein occlusion, or neovascularization
If corneal edema prevents view, state this clearly.
Do not force dilation in suspected acute angle closure.

What you say

“Fundus examination in the left eye is [possible/not possible because of corneal edema]. If visible, I would assess the optic disc for glaucomatous cupping, rim thinning or notching, disc hemorrhage, and retinal nerve-fiber-layer defects. I would also look for retinal causes of secondary glaucoma, especially ischemic retinopathy and retinal vein occlusion.”

Expected finding

In a first acute attack, disc cupping may be absent.
Prolonged/recurrent disease may show glaucomatous optic neuropathy.
Severe sudden pressure elevation can cause disc edema or non-classical optic-nerve damage.

Examiner questions

Q. Can a patient have acute angle closure without optic-disc cupping?
Answer:
Yes. A first acute episode may produce very high IOP before characteristic glaucomatous cupping has developed. “Glaucoma” in acute angle closure is often used clinically because of the dangerous pressure rise, but glaucomatous optic neuropathy must be assessed separately.

Q. What optic-disc changes indicate glaucomatous optic neuropathy?
Answer:
Progressive cupping, vertical enlargement of cup, rim thinning or notching, violation of the ISNT rule, retinal nerve-fiber-layer defects, disc hemorrhage, and corresponding visual-field loss.

Q. Why look for retinal vein occlusion or proliferative diabetic retinopathy?
Answer:
Both can cause retinal ischemia, rubeosis iridis, and neovascular glaucoma, which causes secondary angle closure.

Q. Why are visual fields not the priority in an acute attack?
Answer:
The patient is in pain, vision may be blurred by corneal edema, and immediate management of IOP is more urgent. Perimetry is performed later after stabilization to establish glaucomatous functional damage.

13. The fellow-eye examination

What you say

“The fellow eye must be examined for visual acuity, refraction, anterior chamber depth, IOP, gonioscopy, lens status, and optic-disc appearance. In primary angle closure, the fellow eye commonly has a narrow and potentially occludable angle.”

Examiner questions

Q. What will you expect in the fellow eye?
Answer:
It may have shallow peripheral anterior chamber, narrow angle, hypermetropic refraction, short axial length, thicker lens, or an occludable angle. It may be asymptomatic despite significant risk.

Q. What is an occludable angle?
Answer:
A narrow angle in which the posterior trabecular meshwork is not visible for a substantial circumferential extent on gonioscopy, indicating risk of iridotrabecular contact and angle closure. Exact thresholds vary with guideline and clinical context.

14. How to present the ocular examination in 60 seconds

Use only the positive findings you have actually observed.

“On examination, the patient has reduced visual acuity in the left eye of [value], with no significant pinhole improvement. The left eye shows circumcorneal ciliary congestion, diffuse corneal edema with [microcystic changes/Descemet folds], and a shallow anterior chamber on oblique torchlight and Van Herick assessment. The left pupil is mid-dilated, [vertically oval if present], and poorly reactive to light. Digital palpation suggests increased globe tension, confirmed by an IOP of [value] mmHg by [method]. Gonioscopy demonstrates [closed/narrow] angle with [extent] iridotrabecular contact and [presence/absence] of peripheral anterior synechiae. Fundus examination is [limited by corneal edema/possible], with [disc findings]. The fellow eye has [findings]. These findings are consistent with acute angle-closure glaucoma in the left eye, pending exclusion of secondary causes.”

15. Essential examiner traps

Trap 1: “There is a red eye, so it is conjunctivitis.”

Correct response:
Acute angle closure presents with a painful red eye, but the redness is usually ciliary flush. Reduced vision, haloes, corneal edema, shallow chamber, mid-dilated poorly reacting pupil, and markedly raised IOP indicate acute angle closure rather than conjunctivitis.

Trap 2: “A shallow central chamber is necessary.”

Correct response:
No. Peripheral shallowing can be more pronounced than central shallowing, particularly in pupillary block. Assess the peripheral chamber and confirm by gonioscopy.

Trap 3: “The IOP is normal, so angle closure is excluded.”

Correct response:
No. Intermittent, early, or partially resolved angle closure can have normal IOP. Clinical suspicion and gonioscopy remain important.

Trap 4: “Perform dilated fundus examination immediately.”

Correct response:
No. Pharmacological dilatation may worsen angle closure. Initially examine the disc without dilatation, stabilize IOP, and dilate only if needed under appropriate ophthalmic supervision.

Trap 5: “Give pilocarpine immediately in every bilateral angle closure.”

Correct response:
No. Bilateral angle closure with acute myopic shift, especially after topiramate or sulfonamide drugs, suggests ciliochoroidal effusion and non-pupillary-block angle closure. Pilocarpine can worsen this mechanism. A medication history and mechanism assessment are essential.

16. Examination findings that suggest a secondary cause

Finding	Possible secondary cause
Bilateral acute angle closure, sudden myopic shift, recent topiramate/sulfonamide	Drug-induced ciliochoroidal effusion
Intumescent cataract, asymmetric shallow chamber	Phacomorphic glaucoma
Posterior synechiae, cells/flare, iris bombe	Uveitic pupillary block
Rubeosis iridis, retinal ischemia	Neovascular glaucoma
Trauma, lens subluxation, irregular deep/shallow chamber	Lens-related or traumatic glaucoma
Marked axial shallowing after ocular surgery	Malignant glaucoma/aquaeous misdirection
Plateau iris configuration after patent iridotomy	Plateau iris syndrome

A recent evidence check found a 2024 systematic review on genetic associations in primary angle-closure disease, but it does not change the standard bedside examination described above (PMID 38546604). The practical diagnostic essentials remain IOP assessment, slit-lamp examination, and gonioscopy, as summarized in the AAO angle-closure guidance.

History differential management

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Give the complete history-taking format with viva answers

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History details Differential And. Managemnent

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Acute Angle-Closure Glaucoma: History, Differential Diagnosis, and Management

This is written for a suspected acute angle-closure glaucoma (AACC/APAC) case, likely the “AGS” noted in your sheet. In the practical examination, say “acute angle closure in the left eye” unless raised IOP, shallow chamber, and gonioscopic closure have been documented.

Emergency statement: “This is an ophthalmic emergency. I will rapidly confirm the diagnosis, start IOP-lowering treatment, control pain and vomiting, and arrange definitive relief of pupillary block, usually by laser peripheral iridotomy.”

A. Detailed history taking

1. Identification data

Ask:

Name, age, sex, occupation, address.
Which eye is affected?
Time and date of onset.
Is this the first episode or recurrent?

How to present

“This is a [age]-year-old [male/female] who presented with acute symptoms in the [right/left] eye for [duration].”

Examiner questions

Q. What is the typical patient profile for primary acute angle closure?
Answer:
Usually an older patient, more often female, hypermetropic, with a short axial length, shallow anterior chamber, and relatively thick or anteriorly positioned lens. Angle closure is also more prevalent in several Asian and Inuit populations.

Q. Why is age a risk factor?
Answer:
With age the crystalline lens thickens and moves relatively anteriorly. This crowds the anterior segment, increases relative pupillary block, and narrows the drainage angle.

2. Chief complaints

Ask the patient in their own words first. Then clarify each symptom.

A. Pain

Ask:

“When did the pain start?”
“Was it sudden or gradual?”
“Is it severe?”
“Where is the pain: inside the eye, brow, forehead, temple, or whole head?”
“Does pain radiate to the head?”
“Has it occurred before?”

Expected answer

Sudden onset, severe unilateral ocular pain.
Frontal, supraorbital, or hemicranial headache.
May worsen in dim illumination or at night.

Presentation

“The patient developed sudden severe pain in the left eye, associated with frontal headache, of [duration].”

Viva

Q. Why does acute angle closure cause severe pain?
Answer:
The sudden marked rise in IOP stretches and irritates ocular tissues supplied by the trigeminal nerve. It produces severe ocular and periocular pain.

Q. Why can an attack occur at night or in a dark cinema hall?
Answer:
Dim illumination causes physiological mid-dilatation of the pupil. The mid-dilated pupil increases iris-lens contact and can precipitate relative pupillary block in an anatomically narrow angle.

B. Diminution of vision

Ask:

“Did vision suddenly become blurred?”
“Can you count fingers, recognize faces, or read?”
“Is visual loss constant or intermittent?”
“Did it improve spontaneously at any time?”

Expected answer

Sudden blurring of vision, often marked.
May be preceded by brief, self-limiting attacks of blurred vision.

Presentation

“There was sudden diminution of vision in the left eye, which was [progressive/static] and [not relieved/partially relieved] spontaneously.”

Viva

Q. Why is vision blurred?
Answer:
Marked IOP elevation causes corneal endothelial dysfunction, leading to corneal edema. The hazy cornea causes visual blur and coloured haloes. Severe or prolonged IOP elevation can also damage the optic nerve.

C. Coloured haloes around lights

Ask:

“Do you see coloured rings or rainbow-like circles around bulbs, headlights, or tube lights?”
“Does it occur in one eye or both?”
“Does it appear only during pain episodes?”

Presentation

“The patient gives a history of coloured haloes around lights in the affected eye.”

Viva

Q. What is the mechanism of coloured haloes?
Answer:
Corneal epithelial edema produces diffraction and scattering of light, producing rainbow-like haloes.

Q. Are coloured haloes specific to glaucoma?
Answer:
No. Similar symptoms may occur with corneal edema from other causes, such as corneal endothelial decompensation. In acute angle closure, haloes occur with pain, redness, shallow chamber, a mid-dilated pupil, and high IOP.

D. Redness and watering

Ask:

“Did the eye become red?”
“Was there watering?”
“Is there sticky discharge or purulent discharge?”
“Are the eyelids stuck together in the morning?”

Interpretation

Acute angle closure: red eye with watering, usually no purulent discharge.
Conjunctivitis: diffuse redness with discharge, itch, grittiness, and usually no severe pain or major loss of vision.

Presentation

“The patient noticed redness and watering of the left eye, without mucopurulent discharge.”

E. Headache, nausea, and vomiting

Ask:

“Is there headache?”
“Where is it located?”
“Did nausea or vomiting occur?”
“Was the patient treated for migraine, gastritis, or neurological illness before the eye symptoms were recognized?”

Presentation

“The ocular symptoms were associated with frontal headache, nausea, and [number] episodes of vomiting.”

Viva

Q. Why does acute angle closure cause vomiting?
Answer:
Severe ocular pain and abrupt IOP elevation activate trigeminal and autonomic pathways, producing nausea, vomiting, sweating, and systemic malaise.

Q. What common diagnostic error can occur?
Answer:
The patient may be initially diagnosed with migraine, acute gastritis, intracranial disease, or acute abdomen if the eye is not examined.

F. Photophobia, discharge, floaters, flashes

Ask:

“Is light painful?”
“Is there a foreign-body sensation?”
“Is there sticky discharge?”
“Do you see floaters, flashes, or a curtain in front of vision?”

Interpretation

Marked photophobia suggests keratitis or anterior uveitis.
Foreign-body sensation and focal pain suggest corneal pathology.
Floaters may suggest uveitis, vitreous inflammation, or retinal pathology.
Flashes/curtain suggest retinal tear or detachment, not typical acute angle closure.

3. History of present illness

This section is very important in viva.

A. Ask about previous intermittent attacks

Ask:

“Have you previously had short episodes of eye pain, headache, blurred vision, or coloured haloes?”
“Did those episodes occur in the evening, in dark places, after emotional stress, or after watching television?”
“Did the symptoms disappear after sleep, rest, or coming into bright light?”

Interpretation

These may indicate subacute or intermittent angle closure that spontaneously resolved when the pupil constricted or the angle reopened.

Presentation

“There is/is no past history of intermittent episodes of transient blurring of vision with haloes and ocular discomfort, suggestive of intermittent angle closure.”

Viva

Q. What is intermittent angle closure?
Answer:
It is transient appositional closure of a narrow angle, causing episodic ocular pain, haloes, blurred vision, and sometimes headache. The episode resolves when the angle reopens spontaneously.

Q. What signs suggest prior attacks?
Answer:
Glaucomflecken, patchy iris atrophy, pigment deposition, peripheral anterior synechiae, and evidence of glaucomatous optic neuropathy may indicate prior or prolonged pressure elevation.

B. Precipitating factors

Ask specifically:

Recent emotional stress?
Dim-light exposure?
Prolonged near work?
Recent pharmacological dilatation at an eye clinic?
Any recent surgery?
Recent general anaesthesia?
Use of inhalers or nebulization?
New systemic medication?

Medications to ask about

Ask:

“Have you recently started medicines for migraine, epilepsy, depression, motion sickness, bladder symptoms, asthma, cold and cough, allergies, or psychiatric illness?”
“Have you used eye drops for dilatation?”
“Any topiramate?”
“Any sulfonamide drug?”
“Any anticholinergic drug?”
“Any sympathomimetic decongestant?”

Important examples:

Topiramate
Sulfonamides
Anticholinergics: atropine, tropicamide, cyclopentolate, oxybutynin, trihexyphenidyl
Sympathomimetics/decongestants
Antihistamines
Tricyclic antidepressants
Antipsychotics/phenothiazines
Inhaled ipratropium, especially if aerosol contacts the eye

Viva

Q. Why is drug history essential?
Answer:
Drugs may precipitate angle closure either by causing pupillary dilatation in a predisposed narrow angle or by causing ciliochoroidal effusion with forward displacement of the lens-iris diaphragm.

Q. Which drug is classically associated with bilateral angle closure and acute myopia?
Answer:
Topiramate. It can cause ciliochoroidal effusion, forward rotation of the ciliary body, shallowing of the anterior chamber, acute myopic shift, and secondary bilateral angle closure.

Q. Why is this distinction important?
Answer:
Topiramate-induced angle closure is not primarily due to pupillary block. Stop the causative drug and treat with cycloplegia, topical steroids, and IOP-lowering medication as indicated. Pilocarpine and laser peripheral iridotomy are generally not useful for this non-pupillary-block mechanism and may worsen anterior rotation.

4. Past ocular history

Ask:

Previous similar attacks?
Previous diagnosis of glaucoma, high IOP, narrow angle, or hypermetropia?
Previous spectacles, especially plus-powered glasses?
Previous eye surgery, laser iridotomy, cataract surgery, trauma, or intravitreal injections?
Previous uveitis?
Previous use of steroid eye drops?
Previous retinal vascular occlusion or diabetic retinopathy?
Any history of ocular trauma?
Previous eye dilation?

Presentation

“There is/is no history of previous ocular trauma, uveitis, intraocular surgery, laser procedure, prolonged steroid use, or diagnosed glaucoma. The patient uses [plus/minus] glasses, suggesting [hypermetropia/myopia].”

Viva

Q. Why ask about hypermetropia?
Answer:
Hypermetropic eyes are often shorter with shallow anterior chambers and narrow angles, predisposing to primary angle closure.

Q. Why ask about trauma?
Answer:
Trauma may cause lens subluxation, phacodonesis, angle recession, hyphema, or secondary glaucoma. Lens displacement can produce pupillary block and secondary angle closure.

Q. Why ask about uveitis?
Answer:
Uveitis can cause posterior synechiae, seclusio pupillae, iris bombe, and secondary pupillary-block angle closure.

5. Past medical history

Ask about:

Diabetes mellitus
Hypertension
Ischemic heart disease
Cardiac failure
Asthma or COPD
Renal disease
Liver disease
Migraine
Epilepsy
Psychiatric illness
Autoimmune disease or inflammatory arthritis
Tuberculosis, sarcoidosis, herpes zoster, syphilis if uveitis is suspected

Why it matters

History	Clinical relevance
Diabetes	Neovascular glaucoma due to proliferative diabetic retinopathy
Hypertension/vascular disease	Retinal vascular occlusion and ocular ischemia
Asthma/COPD	Topical beta-blockers may be contraindicated
Heart block/bradycardia/heart failure	Caution or contraindication to topical beta-blocker
Renal failure	Acetazolamide requires caution/avoidance depending on severity
Sulfonamide allergy	Consider caution with acetazolamide and drug history
Migraine/epilepsy	May point to topiramate use
Autoimmune/infectious disease	Uveitis and secondary glaucoma

Viva

Q. Why ask about asthma before giving timolol?
Answer:
Topical timolol can be systemically absorbed and may precipitate bronchospasm in asthma or severe COPD.

Q. Why ask about renal disease before acetazolamide?
Answer:
Acetazolamide is renally excreted and can cause metabolic acidosis and electrolyte disturbance. It requires caution or avoidance in significant renal impairment.

Q. Why ask about diabetes?
Answer:
Diabetes can cause proliferative retinopathy, retinal ischemia, rubeosis iridis, and neovascular glaucoma, a secondary cause of angle closure.

6. Family history

Ask:

“Does any first-degree relative have glaucoma?”
“Any relative with blindness, laser iridotomy, glaucoma surgery, or severe eye pain attacks?”

Presentation

“Family history of glaucoma is [present/absent].”

Viva

Q. Is family history relevant in angle-closure disease?
Answer:
Yes. Anatomical predisposition and genetic susceptibility may cluster in families. Family history supports screening of at-risk relatives, especially where narrow angles or angle closure are identified.

7. Personal history and allergy history

Ask:

Smoking and alcohol
Bowel and bladder status if vomiting and medication use need clarification
Drug allergy, especially sulfonamides
Current medications, including OTC medications and herbal products

Presentation

“There is no known drug allergy, including sulfonamide allergy,” or state the actual allergy.

8. Negative history to state in final presentation

You should not say every negative point mechanically. Use only relevant exclusions.

“There is no history of ocular trauma, previous uveitis, steroid use, recent pharmacological dilatation, recent topiramate or sulfonamide use, or previous intraocular surgery. There is no purulent discharge or severe photophobia to suggest conjunctivitis or keratitis. There is no history suggestive of diabetes-related neovascular glaucoma.”

B. How to summarize history in one minute

“A [age]-year-old [sex] presented with sudden onset severe pain, redness, and blurring of vision in the [left/right] eye for [duration], associated with coloured haloes around lights, frontal headache, nausea, and vomiting. There is/is no history of previous transient similar episodes suggestive of intermittent angle closure. The patient has [hypermetropia/other risk factor], with no history of trauma, uveitis, ocular surgery, or steroid use. There is no recent history of topiramate, sulfonamide, anticholinergic, sympathomimetic, or mydriatic use. The history is suggestive of acute angle closure, likely primary unless examination identifies a secondary cause.”

C. Differential diagnosis of a painful red eye with reduced vision

1. Main differential diagnosis table

Condition	Pain	Vision	Pupil	Cornea	Anterior chamber	IOP	Key differentiating feature
Acute angle closure	Severe	Markedly reduced	Mid-dilated, sluggish/fixed, may be oval	Diffuse edema, microcysts, Descemet folds	Shallow	Very high	Closed angle on gonioscopy
Acute anterior uveitis	Dull aching, photophobia	Mild to moderate reduction	Small, irregular, sluggish	Usually clear, may have KPs	Cells and flare, may be shallow if iris bombe	Often low initially, may rise later	Consensual photophobia, cells/flare, posterior synechiae
Keratitis/corneal ulcer	Severe, foreign-body sensation, photophobia	Reduced	Usually normal or small	Focal infiltrate/ulcer, fluorescein staining	Usually normal	Normal or reduced	Corneal epithelial defect/infiltrate
Acute conjunctivitis	Grittiness, mild discomfort	Usually normal	Normal	Clear	Normal	Normal	Discharge, diffuse superficial congestion
Scleritis	Severe boring pain, pain on eye movement	Variable	Normal	Usually clear	Normal	Usually normal	Deep violaceous congestion, tenderness, non-blanching vessels
Endophthalmitis	Severe	Markedly reduced	Variable	May be edematous	Hypopyon, vitreous haze	Variable	Postoperative/post-injection history and severe vitritis
Neovascular glaucoma	Severe	Reduced	Often mid-dilated	Edema possible	Variable	High	Rubeosis iridis, retinal ischemia
Phacomorphic glaucoma	Severe	Reduced	Mid-dilated	Edema possible	Shallow	High	Intumescent cataract or lens-related asymmetry
Topiramate-induced angle closure	Often bilateral	Reduced with acute myopia	May be mid-dilated	Edema possible	Shallow	High	Bilateral onset, recent topiramate, acute myopic shift

2. Acute angle closure versus acute anterior uveitis

Feature	Acute angle closure	Acute anterior uveitis
Pain	Sudden, severe	Dull aching with photophobia
Vision	Markedly reduced	Mild to moderate reduction
Haloes	Common	Usually absent
Nausea/vomiting	Common	Uncommon
Pupil	Mid-dilated, fixed/sluggish	Small, irregular, sluggish
Cornea	Diffuse edema	Keratic precipitates possible
Anterior chamber	Shallow	Cells and flare, usually normal depth
IOP	Usually markedly raised	Often low initially, but can rise in uveitic glaucoma
Gonioscopy	Closed angle	Usually open, unless secondary pupillary block

Viva

Q. Why is the pupil small in acute anterior uveitis?
Answer:
Iris sphincter spasm due to inflammation causes miosis. Posterior synechiae can make the pupil irregular.

Q. Why is IOP often low in acute uveitis?
Answer:
Inflammation decreases aqueous production by the ciliary body. IOP can later become raised due to trabeculitis, inflammatory debris, peripheral anterior synechiae, steroid response, or pupillary block.

3. Acute angle closure versus keratitis

Feature	Acute angle closure	Keratitis
Main symptom	Severe deep ocular pain, headache	Foreign-body sensation, pain, photophobia
Cornea	Diffuse edema	Focal infiltrate/ulcer/epithelial defect
Fluorescein	Usually no focal stain	Often positive over epithelial defect
Pupil	Mid-dilated, sluggish	Usually normal or small
IOP	High	Normal or low
Chamber	Shallow	Generally normal
Haloes	Common	Less typical

4. Acute angle closure versus conjunctivitis

Feature	Acute angle closure	Acute conjunctivitis
Pain	Severe	Mild discomfort/grittiness
Vision	Reduced	Usually normal, except temporary blur from discharge
Discharge	Watering only	Mucopurulent/serous discharge
Congestion	Ciliary flush	Diffuse superficial conjunctival injection
Cornea	Hazy/edematous	Clear
Pupil	Mid-dilated and sluggish	Normal
IOP	Raised	Normal

D. Management of acute angle closure

First statement in practical exam

“The patient requires immediate ophthalmology management. The immediate goals are to reduce IOP rapidly, relieve pain and vomiting, clear corneal edema, identify the mechanism, and perform definitive treatment to prevent recurrent closure and optic-nerve damage.”

The modern approach is: lower IOP promptly, then relieve the mechanism of closure. For pupillary-block primary acute angle closure, definitive management is generally laser peripheral iridotomy. Current AAO guidance also emphasizes prompt treatment of the fellow phakic eye when appropriate because of the high risk of a similar attack. See the AAO 2025 guidance.

1. Immediate general measures

Admit or urgently refer to ophthalmology/emergency eye care.
Record baseline:
- Visual acuity
- Pupil findings
- IOP
- Anterior chamber depth
- Gonioscopy if feasible and safe
Keep the patient comfortable, preferably supine if needed.
Give analgesic and antiemetic.
Check systemic contraindications before medications:
- Asthma/COPD
- Bradycardia/heart block
- Heart failure
- Renal failure
- Sulfonamide allergy
- Pregnancy
Recheck IOP after treatment, often at short intervals.

Viva

Q. Why give an antiemetic?
Answer:
Vomiting is common because of severe ocular pain and autonomic stimulation. It increases distress and may interfere with oral medication and procedures.

Q. Why is urgent treatment necessary?
Answer:
Sustained severe IOP elevation can cause irreversible optic-nerve injury, corneal endothelial damage, peripheral anterior synechiae, iris ischemia, and permanent visual loss.

2. Medical reduction of IOP

A. Topical aqueous suppressants

Typical treatment in adults, under ophthalmology supervision:

Timolol 0.5% one drop, unless contraindicated.
Brimonidine 0.1-0.2% one drop.
Dorzolamide 2% one drop, or brinzolamide as available.
A fixed combination may be used depending on local protocol.

Mechanisms

Drug class	Examples	Main action
Beta-blocker	Timolol	Reduces aqueous production
Alpha-2 agonist	Brimonidine	Reduces aqueous production, modestly increases uveoscleral outflow
Carbonic anhydrase inhibitor	Dorzolamide, acetazolamide	Reduces aqueous production

Viva

Q. Why is timolol avoided in asthma?
Answer:
Even topical non-selective beta-blocker can be systemically absorbed and cause bronchospasm. It can also worsen bradycardia, heart block, and decompensated heart failure.

Q. Are prostaglandin analogues the best drugs in the immediate attack?
Answer:
No. They may be useful for longer-term IOP control in selected patients, but their onset is relatively slow for acute crisis management. Immediate treatment focuses on rapidly acting aqueous suppressants, systemic therapy, and definitive relief of the block.

B. Systemic carbonic anhydrase inhibitor

Acetazolamide, commonly:

500 mg oral or IV stat, followed by further dosing based on clinical response and local protocol.

Do not quote a dose in a viva without adding:

“I would check renal function, sulfonamide allergy, electrolyte status, pregnancy status, and local protocol before administration.”

Contraindications/cautions

Significant renal impairment
Severe liver disease/cirrhosis
Existing metabolic acidosis
Significant sulfonamide hypersensitivity
Electrolyte disturbances
Pregnancy requires specialist consideration

Viva

Q. What is the mechanism of acetazolamide?
Answer:
It inhibits carbonic anhydrase in the ciliary epithelium, decreasing bicarbonate formation and reducing aqueous-humour secretion.

Q. What adverse effects may occur?
Answer:
Paresthesia, fatigue, gastrointestinal symptoms, metabolic acidosis, hypokalemia, renal stones, altered taste, and rare serious sulfonamide-type reactions.

C. Hyperosmotic agents for very high or refractory IOP

If IOP remains dangerously high or the cornea remains too edematous for laser treatment, the ophthalmologist may use:

Mannitol 20% IV, commonly 1-2 g/kg infused over about 30-60 minutes, with careful systemic monitoring.
Oral glycerol or isosorbide may be options in selected patients.

Important caution

Mannitol can produce major fluid shifts. Use extreme caution or avoid in:

Heart failure
Pulmonary edema
Severe renal failure/anuria
Significant dehydration or electrolyte disturbance

Viva

Q. How does mannitol lower IOP?
Answer:
It increases plasma osmolality, drawing water from the vitreous and ocular tissues into the intravascular compartment, thereby reducing vitreous volume and IOP.

Q. Why is it dangerous in cardiac failure?
Answer:
The intravascular volume expansion and fluid shifts can precipitate or worsen pulmonary edema and heart failure.

3. Miotic therapy: pilocarpine

Principle

Pilocarpine causes miosis and may relieve pupillary block by pulling peripheral iris away from the trabecular meshwork.

Practical point

In a classic pupillary-block attack, do not rely on pilocarpine at the very start when IOP is extremely high, because the ischemic iris sphincter may not respond. It is usually used after initial IOP reduction, according to local ophthalmology protocol.

A commonly taught regimen is:

Pilocarpine 2-4%, repeated initially, then according to response and protocol.

Do not use pilocarpine routinely if:

Topiramate-induced/non-pupillary-block angle closure is suspected
Malignant glaucoma is suspected
Lens-iris diaphragm is displaced forward from ciliochoroidal effusion
There is concern it may worsen the mechanism

Viva

Q. Why may pilocarpine initially fail in acute angle closure?
Answer:
At very high IOP, the iris sphincter becomes ischemic and may be unresponsive. First reduce IOP, then use miotic therapy if the mechanism is pupillary block.

Q. Why is pilocarpine inappropriate in topiramate-induced angle closure?
Answer:
Topiramate causes ciliochoroidal effusion and forward rotation of the ciliary body. Pilocarpine can increase forward movement of the lens-iris diaphragm and worsen the angle closure.

4. Definitive treatment: laser peripheral iridotomy

Indication

For acute angle closure caused by pupillary block, once the cornea is sufficiently clear and IOP is lowered enough for a safe procedure.

What it does

Laser peripheral iridotomy creates a small full-thickness opening in the peripheral iris. It:

Creates an alternative passage for aqueous from posterior to anterior chamber
Equalizes pressure between posterior and anterior chambers
Relieves iris bombe
Allows the peripheral iris to fall posteriorly
Opens or widens the angle

How to state in viva

“After lowering IOP and clearing the cornea, I will perform laser peripheral iridotomy in the affected eye if pupillary block is the mechanism. I will assess patency and repeat gonioscopy after the procedure.”

Kanski describes laser iridotomy as principally used for primary angle closure and also for secondary pupillary-block angle closure. Kanski’s Clinical Ophthalmology: A Systematic Approach, 10th ed., glaucoma chapter.

Viva

Q. What is the definitive treatment in acute primary angle closure?
Answer:
Laser peripheral iridotomy, after initial IOP reduction, if the mechanism is pupillary block.

Q. When will LPI not solve the problem completely?
Answer:
When there is extensive peripheral anterior synechiae, plateau iris configuration, significant lens-related crowding, chronic angle closure, non-pupillary-block mechanism, or established glaucomatous damage with persistently raised IOP.

Q. What if the cornea is too hazy to perform laser iridotomy?
Answer:
Continue urgent IOP-lowering therapy. Depending on expertise and circumstances, options may include anterior chamber paracentesis, laser peripheral iridoplasty, surgical iridectomy, or lens extraction. The exact choice depends on mechanism, corneal clarity, lens status, IOP, and local specialist resources.

5. Treat the fellow eye

What you say

“I will examine the fellow eye with gonioscopy. If it is anatomically narrow or occludable, prophylactic laser peripheral iridotomy is generally indicated promptly.”

The untreated fellow eye is at high risk because it usually shares the same anatomical predisposition. The AAO angle-closure review reports a substantial risk of attack in an untreated fellow eye and supports prophylactic LPI when the angle is anatomically narrow.

Viva

Q. Why is the fellow eye treated prophylactically?
Answer:
The fellow eye frequently has a narrow occludable angle and can develop an acute attack. Prophylactic LPI prevents pupillary-block angle closure.

6. After the acute episode

Reassess:

Visual acuity
IOP
Corneal clarity
Gonioscopy for residual narrowing or PAS
Patency of iridotomy
Optic disc and OCT retinal nerve fiber layer
Visual fields after stabilization
Need for long-term topical IOP-lowering treatment
Lens status and need for cataract/lens extraction

Further treatment if IOP remains raised after a patent LPI

Topical aqueous suppressants
Prostaglandin analogue in selected long-term cases
Laser peripheral iridoplasty for residual appositional closure or plateau iris
Lens extraction, especially with significant lens-related crowding/cataract
Trabeculectomy or other glaucoma surgery if uncontrolled IOP with established damage and extensive synechial closure

E. Mechanism-specific management viva table

Cause/mechanism	Key clue	First important step	Definitive treatment
Primary pupillary-block angle closure	Unilateral attack, shallow angle, mid-dilated pupil	Rapid IOP reduction	LPI in affected and at-risk fellow eye
Plateau iris	Angle remains narrow after patent LPI	Confirm with gonioscopy/UBM	Laser peripheral iridoplasty, sometimes lens extraction
Phacomorphic glaucoma	Intumescent cataract	Lower IOP and control inflammation	Cataract extraction when safe
Uveitic pupillary block	Cells/flare, posterior synechiae, iris bombe	Steroid + cycloplegic + IOP reduction	LPI or surgical iridectomy if needed
Neovascular glaucoma	Rubeosis iridis, retinal ischemia	IOP control and treat retinal ischemia	PRP/anti-VEGF plus glaucoma procedure as required
Topiramate-induced bilateral angle closure	Bilateral symptoms, acute myopia, recent topiramate	Stop causative drug, cycloplegia, steroid, IOP control	Usually resolves with mechanism-specific treatment; LPI generally not useful
Malignant glaucoma	After surgery, uniform shallow/flat chamber	Cycloplegia and urgent specialist management	Laser/surgical disruption of misdirection, as indicated

F. Final management presentation

“This patient has suspected acute angle closure in the left eye, an ophthalmic emergency. I will document visual acuity and IOP, establish whether the closure is primary pupillary block or secondary, and begin urgent IOP reduction with topical aqueous suppressants such as timolol if not contraindicated, brimonidine, and topical carbonic anhydrase inhibitor, together with systemic acetazolamide if suitable. I will provide analgesia and antiemetic therapy. If IOP remains dangerously high, I will consider hyperosmotic therapy such as IV mannitol after assessing cardiac and renal status. Once IOP is reduced, I will use pilocarpine only when pupillary-block angle closure is confirmed or strongly suspected. Definitive treatment is laser peripheral iridotomy in the affected eye after corneal clearing. The fellow eye requires gonioscopy and usually prophylactic laser iridotomy if anatomically narrow. Long-term review will include gonioscopy, optic-disc evaluation, OCT, visual-field assessment, and consideration of lens extraction or further glaucoma treatment if IOP remains elevated.”

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