Marcus Gunn pupil is a feature of all, EXCEPT:: (A) Optic neuritis, (B) Papilloedema, (C) Optic atrophy, (D) Retinal detachment
Answer is B. Marcus Gunn Pupil: In swinging flashlight test, the pupil on the diseased side dilates on transferring light to it. It is positive in the following cases: Optic neuritis Optic atrophy Retinal detachment Central retinal vein occlusion Central retinal aery occlusion Ref: Review of ophthalmology A.K.Khurana, 5Th Ed, page 22.