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Arcus senilis and cataract. Close-up of the eye of an elderly diabetic man, showing the eye condition arcus senilis (greyish line around the edge of the iris) and cataract (opacity in the eye lens). Arcus senilis consists of an infiltration of fatty material and is common in the elderly. When it occurs in younger people it may indicate abnormal fat metabolism. Arcus senilis never affects vision. Senile cataract is frequently found in the elderly, resulting in blurred vision and may ultimately cause blindness. Diabetic patients are more prone to cataract; other causes of cataract are metabolic disease, direct injury, and prolonged exposure to infrared rays of light.
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