is opacification of natural lens
of the eye. The cause can be congenital or acquired.
The most common cause is acquired, in that because of age related called as senile cataract. As the age advances because of physiological changes occurring in the eyes.
The other causes for cataract are congenital causes because of hereditary or inherited conditions, injury
to the eyes, metabolic diseases like diabetes mellitus
, inflammations inside the eye, diseases of the eye ....