In collie eye anomaly, choroidal hypoplasia is most commonly located relative to the optic nerve head?

• A. Medial to the optic nerve head
• B. Lateral to the optic nerve head
• C. Superior to the optic nerve head
• D. Inferior to the optic nerve head

Answer: (B)

In collie eye anomaly, choroidal hypoplasia most often appears on the lateral (temporal) side of the optic nerve head. This reflects a developmental defect that preferentially affects the choroid in the posterior pole toward the lateral retina, so you’ll typically see a pale, underdeveloped choroid just to the side of the nerve. The medial, superior, or inferior positions are less characteristic for this lesion, making the lateral location the best-known pattern in this condition.