A blood clot developing in the vein draining the retina occurs in retinal vein occlusion. The sudden obstruction of the blood flow away from the eye can lead to bleeding in the retina and loss of vision. This disorder is most commonly seen in older individuals who have significant atherosclerosis. In addition, hypertension is a risk factor as well as conditions that make the blood clot more easily. If a small vein is obstructed, the symptoms may be mild. If a major vein is blocked, the symptoms are usually rapid and severe.
Causes of Retinal Vein Occlusion
Disorders that increase the viscosity of the blood and make it "more sticky" may lead to retinal vein occlusion. Some conditions which can produce this state are inherited disorders, smoking, use of estrogen and polycythemia. Hypertension and atherosclerosis may damage the vessels, making them more subject to developing clots.
Signs and Symptoms of Retinal Vein Occlusion
Common symptoms include blurred vision is there is bleeding within the retina or fluid immediately in front of it. If a major draining vein is obstructed, the retina will become damaged and visual loss will occur over several hours.
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Medical Content Last Updated on 07/12/2008
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