The retina is a light-sensitive tissue in the back of your eye. The retina receives its blood supply through the retinal artery and retinal vein. When the vein becomes blocked, it’s called a retinal vein occlusion. If the artery becomes blocked, it’s called a retinal artery occlusion—also known as a stroke. When the vein is blocked, blood and fluid spill out into the retina. When this happens, the area of the retina called the macula may become swollen. The swelling affects your central vision.
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