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Subjects/Ophthalmology/Ophthalmology
Ophthalmology
medium
eye Ophthalmology

Keyhole-shaped visual field defect is seen in lesion involving which of the following regions?

A. Optic disk
B. Optic chiasma
C. Lateral geniculate body
D. Occipital lobe

Explanation

Ans: C. Lateral geniculate body(Ref Walsh and Hoyt; Clinical Neuro-Ophthalmology 6/e p122)Key-hole shaped visual field defects are typically seen in the lesions involving lateral geniculate body but keyhole shaped defect (not visual field defect) is seen in the coloboma of Iris.

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