Retinal venous occlusive disease is second only to diabetic retinopathy as a cause of retinal vascular disease, The occlusion of a branch retinal vein may produce a branch retinal vein occlusion (BRVO), and the occlusion of the central retinal vein may result in a central retinal vein occlusion (CRVO). The term hemiretinal vein occlusion (HRVO) describes those eyes in which the superior or inferior retinal venous vasculature has been occluded, The incidence of retinal vein occlusions in population-based studies varies from 2 per 1000 to 8 per 1000 persons and increases with age.
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