A cataract is an opacity that develops in the lens of the eye, which lies behind the iris and the pupil.The lens works much like a camera lens, focusing light onto the retina at the back of the eye. The lens also adjusts the eye's focus, letting us see things clearly both up close and far away.
Cataracts develop from a variety of reasons, including long-term ultraviolet exposure,exposure to radiation, secondary effects of diseases such as diabetes, or simply due to advanced age; they are usually a result of Denaturation of lens. genetic factors are often a cause of congenital cataracts and positive family history may also play a role in predisposing someone to cataracts at an earlier age, a phenomenon of "anticipation" in pre-senile cataracts. Cataracts may also be produced by eye injury.read more....
