All sorts of reasons, such as aging, genetics, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc., can cause metabolic disorders in the lens, leading to the denaturation of the lens proteins and resulting in opacity known as cataract. At this point, the light is obstructed by the opaque lens and cannot be projected onto the retina, causing blurred vision. It is commonly seen in people over the age of forty, and the incidence increases with age. This disease can be divided into congenital cataracts and acquired cataracts. Congenital cataracts are also known as developmental cataracts, and there are six types of acquired cataracts.