A young patient presented with sudden painless loss of vision with systolic murmur over chest, ocular examination reveals – cherry red spot in macula with clear AC, with perception of light, diagnosis –: (A) Central retinal artery occlusion, (B) Central retinal vein occlusion, (C) Macular choroiditis with infective endocarditis, (D) Central serous retinopathy
Answer is A. Amongst the given options CRVO, CRAO and central serous retinopathy can cause sudden painless loss of vision. However following features favour the diagnosis of CRAO :-


Cherry red spot
Systolic murmur (suggests cardiac lesion which may be the source of emboli)