A cataract is a clouding of the eye's natural lens inside the eye. The word cataract
is derived from a Greek word meaning "waterfall" (looking through falling water).
Nearly half of the population over 65 will have some degree of cataract formation
in their lifetime. Cataracts are most commonly caused by natural chemical changes
within the lens of the eye, which is thought to be part of the natural aging process,
but can also occur as a result of trauma, UV exposure, certain medications and systemic
disease. A cataract is not considered a disease of the eye and presently there is
no proven method of prevention. Cataract surgery is the treatment option when vision
and lifestyle functionality are compromised.