A cataract is a misting or opacity of the natural crystalline lens of the eye. It prevents light from entering the eye and causes a dimness of vision. If the cataract is allowed to progress without treatment, vision can be seriously limited. As cataract is a slow progressing disease, many patients do not realize that their cataract have started to develop. Yellowing or misting of the natural lens in the eye may start developing at the age of 40.
Most cataracts are the result of the body’s natural ageing process, though some may be the result of injury to the eye. Rarely, cataracts can occur in infancy due to abnormal development of the eye.