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Central retinal vein occlusion; Branch retinal vein occlusion; CRVO; BRVO
Retinal vein occlusion is a blockage of the small veins that carry blood away from the retina. The retina is the layer of tissue at the back of the inner eye that converts light images to nerve signals and sends them to the brain.
Retinal vein occlusion is most often caused by hardening of the arteries (atherosclerosis) and the formation of a blood clot.
Blockage of smaller veins (branch veins or BRVO) in the retina often occurs when retinal arteries that have been thickened or hardened by atherosclerosis cross over and place pressure on a retinal vein.
Rick factors for retinal vein occlusion include:
Because the risk of these disorders increases with age, retinal vein occlusion most often affects older people.
Blockage of retinal veins may cause other eye problems, including:
Sanborn GE, Magargal LE. Venous occlusive disease of the eye. In: Tasman W, Jaeger EA, eds. Duane's Ophthalmology. 15th ed. Philadelphia, Pa: Lippincott, Williams & Wilkins: 2009:chap 15.
Wu L, Arevalo JF, Roca JA, Maia M, Berrocal MH, Rodriguez FJ, et al. Pan-American Collaborative Retina Study Group (PACORES). Comparison of two doses of intravitreal bevacizumab (Avastin) for treatment of macular edema secondary to branch retinal vein occlusion: results from the Pan-American Collaborative Retina Study Group at 6 months of follow-up. Retina. 2008;28:212-219.
Kreutzer TC, Alge CS, Wolf AH, Kook D, Burger J, Strauss R, et al. Intravitreal bevacizumab for the treatment of macular oedema secondary to branch retinal vein occlusion. Br J Ophthalmol. 2008;92:351-355.
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