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 –

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)