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lens
(lenz)
a piece of glass or other transparent material so shaped as to converge or scatter light rays. See also glasses
Lenses: (A–F), Spherical lenses: (A), biconvex; (B), biconcave; (C), planoconvex; (D), planoconcave; (E), concavoconvex, periscopic convex, converging meniscus; (F), convexoconcave, periscopic concave, diverging meniscus; (G, H), cylindrical lenses, concave and convex..
the transparent, biconvex body separating the posterior chamber and the vitreous body of the eye; it refracts (bends) light rays so that they are focused on the retina. In order for the eye to see objects close at hand, light rays from the objects must be bent more sharply to bring them to
focus on the retina; light rays from distant objects require much less refraction. It is the function of the lens to do accommodation, making of adjustments for viewing both near objects and more distant ones. To accomplish this it must be highly elastic
so that its shape can be changed and made more or less convex. The more convex the lens, the greater the refraction. Called also crystalline lens.
Lens of eye.
Copyright 2007. An Elsevier publication. All rights reserved.
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