An elderly male with hea disease presents with sudden loss of vision in one eye; examination reveals cherry red spot; diagnosis is:

B i.e. Central Retinal Aery Occlusion Central retinal aery occlusion characteristically presents with sudden painless loss of vision, cherry red spot & cattle-truck appearanceQ (of retinal veins usually). Source of emboli from carotid aery & hea disease, and thrombus from aeriosclerosis along with hypeension & aeritis are predisposing factors.