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Cataracts can be caused by disease, but are generally caused by aging. Definition: Clouding of the natural lens of the eye, usually caused by aging in conjunction with other risk factors, such as exposure to the sun's UV rays, smoking, steroid intake and Diabetes. Symptoms include blurred vision, glare, halos around lights, colors that are less bright, a cloudy spot in your vision and, sometimes, temporary vision improvement

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Q: Is cataract a virus infection or disease?
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