Unilateral sudden complete loss of vision (Amaurosis fugax) is due to lesion in -: (A) Internal carotid aery, (B) Middle cerebral aery, (C) Anterior cerebral aery, (D) Basilar aery
Answer is A. Amaurosis fugax refers to sudden temporary and painless monocular visual loss occurring due to a transient failure of retinal circulation. COMMON CAUSES: Carotid transient ischemic attack, embolization of retinal circulation, papilloedema, giant cell aeritis, Raynaud's disease, migraine, as a prodromal symptom of central retinal aery or carotid aery occlusion, hypeensive retinopathy, and venous stasis retinopathy. Reference: Comprehensive Opthalmology, A K Khurana; 6th edition.pg no331.