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
(C) 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.