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crystalline lens

noun, Anatomy
1.
a doubly convex, transparent body in the eye, situated behind the iris, that focuses incident light on the retina.
Origin
1785-1795
1785-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for crystalline lens

crystalline lens

noun
1.
a biconvex transparent elastic structure in the eye situated behind the iris, serving to focus images on the retina
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for crystalline lens

in anatomy, a nearly transparent biconvex structure suspended behind the iris of the eye, the sole function of which is to focus light rays onto the retina. The lens is made up of unusual elongated cells that have no blood supply but obtain nutrients from the surrounding fluids, mainly the aqueous humour that bathes the front of the lens. Waste products are removed through these fluids as well. The shape of the lens can be altered by the relaxation and contraction of the ciliary muscles surrounding it, thus enabling the eye to focus clearly on objects at widely varying distances. The ability of the lens to adjust from a distant to a near focus, called accommodation, gradually declines with age (a condition called presbyopia), often requiring correction. Clouding or opacity of the lens, called a cataract, may also occur with age. Cataracts that interfere with vision can be corrected by surgery, during which the clouded lens is removed and replaced with an artificial lens

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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