الفهرس 
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Abstract
Central retinal vein occlusion (CRVO), is one of the most frequent retinal vascular disorders in clinical practice. Macular edema (ME) is one of the most common findings and also the main reason for decreased visual acuity (VA) in early CRVO . It involves a spectrum of different pathologic changes of the retina, including intra retinal accumulation of fluid with diffuse retinal thickening or formation of cystoid spaces, sub retinal fluid accumulation, or macular traction due to epiretinal membrane formation or PVD. (Eva Hoeh A et al., 2010; Pears A, Srinivas R,2011)
With optical coherence tomography (OCT), a precise measurement of these structural changes can be performed, allowing an objective assessment of these morphologic parameters , as it provides cross-sectional images of the retina, which mimic the histological sections of light microscopy. (Eva Hoeh A et al., 2010; Pears A, Srinivas R,2011)
20 eyes of 20 patients Clinically diagnosed (CRVO). were examined using ex OCT and FA .Eyes with Media opacities ,as cataract were excluded.
Our study includes 13 (65.0%) male and 7 (35.0%) female. the age ranged from 35-62 years with mean of 49.4.years, Left eyes were more affected 57.9%. hypertension in 30.0%, Diabetes mellitus in 10.0%,
We studied the relation between manually measured central macular thickness and best corrected visual acuity by log MAR; there was no statistical significant relation between CST &BCVA.
Visual acuity is related to duration of the disease as atrophic changes in late stages lead to foveal thinning and poor visual acuity.