Cataracts develop as a result of many factors in old age. Most commonly it is because of long standing diabetes. There is deposition of crystalline substances on the lens within the orbit, which gradually causes your lens to harden and lose its flexibility.
A Cataract is a clouding of the eye’s lens, the area that lies behind the iris and the pupil. Cataracts are said to be the main cause for blindness in the world, old people around after 40 years of age tend to lose.