💡 Explanation (Answer: C)

The Catford drum test assesses visual acuity in neonates by observing optokinetic nystagmus responses to moving targets of varying sizes. It is an objective method suitable for infants who cannot perform subjective recognition tests.

💡 Explanation (Answer: C)

Zonular cataracts, also known as lamellar cataracts, are the most frequently occurring clinically significant congenital cataracts. They typically affect a specific zone of the lens and often have a genetic predisposition.

💡 Explanation (Answer: B)

The eye popping test relies on a reflexive widening of the eyelids when room lights are suddenly dimmed, indicating gross visual perception. This behavioral response is useful for very young infants who cannot fixate or follow targets reliably.

💡 Explanation (Answer: B)

Retinal evaluation for Retinopathy of Prematurity (ROP) is generally recommended at 4 weeks of postnatal age or 31 weeks post-menstrual age, whichever is later. Timely screening ensures early intervention for high-risk infants.

💡 Explanation (Answer: D)

The most frequent clinical signs of retinoblastoma are leucocoria (white pupillary reflex) followed by strabismus. Recognition of these signs is vital for early diagnosis and preservation of life and vision.

💡 Explanation (Answer: B)

Buphthalmos, or primary congenital glaucoma, presents with the classic triad of epiphora, photophobia, and blepharospasm. The elevated intraocular pressure causes the immature eye to enlarge, leading to a large, often hazy cornea.

💡 Explanation (Answer: A)

Coat’s disease is an idiopathic condition characterized by retinal telangiectasia and intraretinal or subretinal exudation, predominantly affecting young males. It often leads to exudative retinal detachment if left untreated.

💡 Explanation (Answer: B)

Retinoblastoma most commonly spreads directly through the optic nerve to the brain. This mode of extension makes optic nerve evaluation critical during enucleation to ensure complete tumor removal.

💡 Explanation (Answer: D)

Congenital nasolacrimal duct obstruction is most frequently caused by a membranous block at the Valve of Hasner at the distal end of the duct. Spontaneous resolution is common, but probing may be required if it persists.

💡 Explanation (Answer: D)

Anisometropic amblyopia develops when unequal refractive errors cause the brain to chronically suppress the blurred image from the eye with the higher prescription. It is a common cause of amblyopia and requires optical correction and often occlusion therapy.