Cataract is a medical condition in which the lens of the eye becomes progressively opaque, resulting in blurred vision. Most cataracts are related to aging. It is the most common cause of vision loss in people over age 40 and is the principal cause of blindness in the world. The lens in human eye is made of mostly water and protein. The protein is arranged in a precise way that keeps the lens clear and lets light pass through it. As we age, some of the protein may clump together and start to cloud a small area of the lens. This is a cataract. Over time, the cataract may grow larger and cloud more of the lens, making it harder to see. A cataract is not contagious and cannot spread from one eye to the other or from person to person. Cataracts do not cause the eye to tear abnormally. They are neither painful nor make the eye itchy or red.
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