A cataract causes clouding of the lens in your eye. The lens is located behind the iris which is the coloured part of the eye, and works like the lens of a camera. Cataracts are caused by the aging process, sun damage, injury, some medications or it may be congenital. Cataracts cause images to be blurred, seeing at night is more difficult, and glasses or contact lenses no longer seem to help with reading or simple tasks.
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