retinal vein occlusion

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retinal vein occlusion n. blockage of a vein carrying blood from the retina. branch r. v. o. blockage of one of the small branches of the central retinal vein, resulting in painless reduction of vision in the affected area. central r. v. o. blockage of the central retinal vein, which leaves the eye at the optic disc, usually resulting in sudden painless reduction of vision.

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