<prompt> 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, diagnosisCentral retinal artery occlusionCentral retinal vein occlusionMacular choroiditis with infective endocarditisCentral serous retinopathy  <response>: 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 spotSystolic murmur suggests cardiac lesion which may be the source of emboli 