Cataract

   In ophthalmology a cataract - any blackness which develops in the transparent lens of an eye or in its envelope. The name gains from Latin cataracta value of "waterfall" and Greek kataraktes and katarrhaktes, from katarassein value, "to rush downwards" (kata - "downwards"; arassein, "to strike, rush").

   Cataracts are shaped for parents, including long-term ultra-violet exposure, by-effects of illnesses, such as diabetes, or is simple because of the advanced age; they usually - effect of a denaturation of fibers of a lens. Genetic factors often - the parent of congenital cataracts also can play also a role in predisposition someone to cataracts. Completely half of all people between age 65 and 74 and approximately 70 % from that at more than 75 is some formation of a cataract. Cataracts can be yielded also an eye wound or a physical trauma. Examination among pilots Icelandair has shown to commercial pilots of airline so three times more probable to develop cataracts as people with nepoletom workplaces. It as think, is caused by radiation arriving from space.

   Cataracts can be constant or progressive, firm or soft.

Prevention

   Though cataracts do not have proved prevention any from the scientific point of view, is sometimes said, that clothes wearing is ultra-violet protecting dark glasses can slow down development of cataracts. The regular consumption of antioxidants (such as vitamin C and E) is theoretically useful, but it also is not proved.