USMLE Step 1 Question of the Week #12

A 60-year-old man presents to ophthalmologist with history of progressive decline in vision in his right eye for last six months. After complete ocular examination, the ophthalmologist confirms diagnosis of cataract in his right eye. Additionally, he also notes a congenital defect in his iris on both sides. Image of the iris defect in his left eye is shown below.

Failure of closure of choroid fissure during which week of gestation results in above defect?

A. Week 6

B. Week 7

C. Week 8

D. Week 10

E. Week 11

QID #1017

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