Encyclopedia > Cataract

  Article Content

Cataract

A cataract is any opacity which develops in the crystalline lens of the eye or in its envelope. Cataracts form for a wide variety of reasons, including ultraviolet exposure, secondary effects of diseases such as diabetes, or simply due to advanced age; they are usually a result of denaturation of lens proteins. Genetic factors may also play a role in predisposing someone to cataracts, or conditions of intrauterine development, or injuries to the eye.

Cataracts may be partial or complete, stationary or progressive, hard or soft. Treatment of a cataract which is not complicated by any other eye conditions is relatively simple; the opaque lens is removed, and usually replaced with a synthetic plastic lens. If the lens is not replaced, strong glasses can make up for the loss of focusing ability.


Cataract is also a term used to mean a waterfall or where the flow of a river changes dramatically. It comes from a Greek word meaning "downrush" or "to dash down".



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Dennis Gabor

... - Wikipedia <<Up     Contents Dennis Gabor Dennis Gabor (Gábor Dénes) (1900-1979) was a Hungarian physicist. He invented holography in ...

 
 
 
This page was created in 55.6 ms