الفهرس 
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Abstract
Central retinal vein occlusion (CRVO) is the second most common retinal vascular disorder, exceeded only by diabetic retinopathy. Three forms of central retinal vein occlusion may be recognized. This is important from therapeutic point of view these are:- I) Non- Ischaemic form, (75%) which is also called venous -stasis retinopathy. 2)Ischaemic form, (20%) which is also called haemorragic retinopathy. Optic disc vasculitis or papillophelebitis. It affect young apparantly health adults & visual acuity is rarely affected.Some eyes with CRVO, if left untreated, will develop neovascular glaucoma (often called 90-day glaucoma because of the speed with which it strikes),. If this glaucoma is left untreated, the eye most frequently will suffer from intractable pain. Fortunately, pan-retinal photocoagulation (PRP) will arrest the development of neovascularizatin thus” curing” the disorder. Unfortuately PRP has several unpleasant effects. It can exacerbate existing macular oedema, constrict visual fields and cause night blindness. Thus, it makes sense to try to identify the eyes with CRVO that are likely to develop neovascularization of the iris.