Unilateral sudden complete loss of vision (Amaurosis fugax) is due to lesion in -

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.