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Purkinje-Sanson image

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Any of three images that can be seen reflected from the eye of a person who is looking at an illuminated object such as a flame in a dark room. The first is a bright image reflected from the convex surface of the cornea; the second is a large, dim image reflected from the convex front surface of the crystalline lens; and the third is a small, bright, inverted image that is reflected from the rear (posterior) surface of the lens and that enlarges with accommodation (1) of the eye for close viewing, because the curvature of the lens increases, such accommodation also causing the distance between the second and third images to change. Also spelt Purkyně–Sanson image. Also called a Purkinje image or a Sanson image. [So called because it was first observed in 1823 by the Czech-born German physiologist Johannes E(vangelista) Purkinje (Purkyně) (1787–1869) and investigated further in 1838 by the French surgeon Louis Joseph Sanson (1790–1841)]

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