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1. [Middle English, from Middle French or Medieval Latin; Middle French catharacte, from Medieval Latin cataracta, from Latin, portcullis] : a clouding of the lens of the eye or of its surrounding transparent membrane that obstructs the passage of light. 2. a. obsolete : waterspout. b. : waterfall. especially : a large one over a precipice. c.
The Editors of Encyclopaedia Britannica. Article History. Rhine Falls, on the upper Rhine River near Schaffhausen, Switzerland. cataract, a waterfall ( q.v. ), especially one containing great volumes of water rushing over a precipice. This article was most recently revised and updated by Amy Tikkanen.
- The Editors of Encyclopaedia Britannica
Word History and Origins. Origin of cataract 1. First recorded in 1350–1400; Middle English cataracte, from Latin catar (r)acta, from Greek katarráktēs “waterfall, floodgate, portcullis” (noun), “downrushing” (adjective), from katarássein “to dash down,” from kat- cata- + arássein “to dash, smite”.
A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision of the eye. [1] [7] Cataracts often develop slowly and can affect one or both eyes. [1] . Symptoms may include faded colours, blurry or double vision, halos around light, trouble with bright lights, and difficulty seeing at night. [1] .
A cataract is a shallow stretch of turbulent waters formed where flowing waters encounter resistant rock layers. In the case of the Nile cataracts, large outcroppings of granite make the flow of the river unpredictable and much more difficult to traverse by boat.
The Cataracts of the Nile are shallow lengths (or whitewater rapids) of the Nile river, between Khartoum and Aswan, where the surface of the water is broken by many small boulders and stones jutting out of the river bed, as well as many rocky islets.
Aug 24, 2023 · Cataract History. Cataracts have been known to mankind for centuries. A cataract is a white or cloudy patch that develops in the eye lens, reducing the amount of light that passes through it and ...
