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A '''cataract''' is a clouding of the lens in the [[eye]].  Cataracts are very common in older people. By age 80, more than half of all people in the United States either have a cataract or have had cataract surgery.<ref name=NIH2009>{{cite web|title=Facts About Cataract|url=https://www.nei.nih.gov/health/cataract/cataract_facts|accessdate=24 May 2015|date=September 2009}}</ref>

[[File:Cataract in human eye.png|thumb|right|Cataract in a human eye]]A '''cataract''' is a clouding of the lens in the [[eye]].  Cataracts are very common in older people. By age 80, more than half of all people in the United States either have a cataract or have had cataract surgery.<ref name=NIH2009>{{cite web|title=Facts About Cataract|url=https://www.nei.nih.gov/health/cataract/cataract_facts|accessdate=24 May 2015|date=September 2009}}</ref>

Common symptoms are

Common symptoms are