Thursday, June 21, 2018

Causes of cataracts


Cataracts develop for various reasons, such as prolonged exposure to ultraviolet light, radiation, secondary effects of diseases such as diabetes and hypertension, old age, or trauma (may occur earlier) and usually due to denaturation of the protein lens.

Genetic factors are often the cause of congenital cataracts and a positive family history may also play a role in predisposing a person to cataracts at an earlier age, the phenomenon of "anticipation" in pre-senile cataracts.

Cataracts can also be caused by injury to the eyes or physical trauma. A study showed cataracts developed among commercial aircraft pilots three times larger than those with jobs other than pilots. This is thought to be caused by excessive radiation coming from outer space.

Cataracts are also usually common in people who are exposed to infrared radiation, such as the glass (blowing) smithers who suffer from "peeling syndrome". Exposure to microwave radiation can also cause cataracts. Atopic or allergic conditions are also known to accelerate the development of cataracts, especially in children.

Cataracts may occur only partially or completely, stationary or progressive, hard or soft.

Some drugs can induce cataract development, such as corticosterone and Seroquel.