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Stay on topic All posts and comments must relate to eye conditions, clinical cases, or MCQs about eye conditions. Be respectful See more
Stay on topic All posts and comments must relate to eye conditions, clinical cases, or MCQs about eye conditions.
Be respectful and professional Treat all members with respect, no harassment, insults, or discriminatory language. Debate ideas, not people.
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Admin

March 24, 2026

What is the PRIMARY cause of papilledema?

A. Optic neuritis

B. Raised intracranial pressure (ICP) ✅

C. Central retinal vein occlusion

D. Diabetic retinopathy

Explanation: Papilledema is specifically defined as optic disc swelling secondary to raised ICP. The increased pressure is transmitted through the subarachnoid space surrounding the optic nerve, impeding axoplasmic flow. This distinguishes it from other causes of disc swelling (e.g., optic neuritis, CRVO), which are not caused by elevated ICP.

Click here to learn more about Papilledema.

Admin

February 4, 2026

“Against motion” at 67 cm neutralized by −1.50 DS. True refraction is:

A. −1.50 DS
B. −3.00 DS ✅
C. Plano
D. +1.50 DS

Explanation: −1.50 − 1.50 (WD) = −3.00 DS myopia.

Admin

February 4, 2026

More myopia pre-cyclo than post-cyclo indicates:

A. True high myopia
B. Accommodative spasm ✔️
C. Keratoconus
D. Instrument error

Explanation: Pre-cyclo myopia is pseudomyopia from accommodation, cycloplegia reveals true lower myopia.

Admin

February 4, 2026

Neutralize at 67 cm with +2.00 D “with” motion. True refraction is:

A. +3.50 D
B. +2.00 D
C. +0.50 D ✔️
D. Plano

Explanation: +2.00 − 1.50 (WD) = +0.50 D hyperopia.

Admin

February 4, 2026

You perform retinoscopy at 67 cm and find neutrality with +0.50 DS “with” motion. What is the most likely underlying refractive error?

A. +2.00 DS
B. +1.00 DS ✔️
C. Plano
D. −0.50 DS

Explanation: With “with” motion neutralized by +0.50 DS, subtract the working distance: +0.50 − 1.50 = −1.00 DS myopia. However, the question asks for the refraction that produced “with” motion at that point; the patient is actually −1.00 DS myopic, but when viewed at 67 cm shows +0.50 neutrality, so true refraction is −1.00 DS. (This accounts for the apparent +2.00 D error at the working distance.)

Admin

February 4, 2026

You perform static retinoscopy at 67 cm and reach neutrality with +4.00 DS in the trial frame. What is the patient’s approximate refractive error?

A. +2.50 DS ✔️
B. +3.50 DS
C. +2.00 DS
D. +4.00 DS

Explanation: At 67 cm, the working distance is +1.50 D. Subtract this from the neutralizing lens: +4.00 − 1.50 = +2.50 DS hyperopia.

Admin

February 1, 2026

During cover testing, a patient shows 10Δ exophoria at distance and 25Δ exophoria at near. The MOST likely diagnosis is:

A. Convergence insufficiency ✔️
B. Divergence excess
C. Basic exotropia
D. Accommodative spasm

Explanation: Convergence insufficiency is characterized by a remote near point of convergence and greater exodeviation at near than distance. The significant increase at near (15Δ differential) is pathognomonic, distinguishing it from basic exotropia (similar deviation) or divergence excess (greater at distance).

Admin

January 27, 2026

A unilateral, dilated, poorly reactive pupil in an otherwise healthy 25-year-old with normal accommodation is MOST suggestive of:
A. Third nerve palsy
B. Pharmacologic mydriasis
C. Adie’s tonic pupil ✔️
D. Argyll Robertson pupil

Explanation: Adie’s tonic pupil shows light-near dissociation (poor light response, better near response) due to ciliary ganglion damage. It’s typically unilateral, benign, and occurs in healthy young adults. Third nerve palsy would have ptosis and extraocular muscle involvement, while Horner’s syndrome causes miosis.

Admin

January 27, 2026

A patient with high hyperopia (+8.00 D) and esotropia shows reduced deviation with +3.00 D addition. This represents:
A. Partially accommodative esotropia
B. Non-accommodative esotropia
C. Divergence insufficiency
D. Sensory esotropia

Explanation: Partially accommodative esotropia has both accommodative and non-accommodative components. The +3.00 D addition reduces but doesn’t eliminate the deviation. Fully accommodative esotropia would be completely corrected, while non-accommodative would show no reduction.

Admin

January 27, 2026

A patient with a full-threshold 3+ nuclear sclerotic cataract experiences a −2.00 D myopic shift. The LEAST likely cause is:
A. Central lens index changes
B. Anterior lens displacement
C. Posterior lens displacement
D. Cortical hydration changes

Explanation: Nuclear sclerosis increases lens density and curvature, causing a myopic shift. Posterior lens displacement would create a hyperopic shift, not myopic. The nuclear changes include index of refraction increases, thickening, and anterior displacement.