The Sixth Cataract is where the Nile cuts through the Sabaluka pluton near Bagrawiyah (16°17′17″N 32°40′16″E  /  16.288°N 32.671°E  / 16.288; 32.671  (Sixth Cataracthttp://en.wikipedia.org/wiki/Cataracts_of_the_Nile
See illustrations and animations explaining cataract surgery, learn about new lens replacement options and the outcomes and possible complications.http://www.allaboutvision.com/conditions/cataract-surgery.htm
Definition of cataract from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.http://www.merriam-webster.com/dictionary/cataract
cat·a·ract (k t-r kt) n. 1. A large or high waterfall. 2. A great downpour; a deluge. 3. Pathology Opacity of the lens or capsule of the eye, causing impairment of vision or blindness.http://www.thefreedictionary.com/cataract
cataract, in medicine, opacity of the lens of the eye, which impairs vision. In the young, cataracts are generally congenital or hereditary; later they are usually the result of ...http://encyclopedia2.thefreedictionary.com/cataract
cataract /cat·a·ract/ (-rakt) an opacity of the crystalline lens of the eye or its capsule.catarac´tous. after-cataract a recurrent capsular cataract.http://medical-dictionary.thefreedictionary.com/cataract
noun. a large waterfall; any strong flood or rush of water; deluge; an eye disease in which the crystalline lens or its capsule becomes opaque, causing partial or total blindnesshttp://www.yourdictionary.com/cataract
