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- Noun

An instrument for dividing the cornea in operations for cataract.

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    A keratometer, also known as an ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism. It was invented by the German physiologist Hermann von Helmholtz in 1851, although an earlier model was developed in 1796 by Jesse Ramsden and Everard Home.

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    Keratomileusis, from Greek κέρας (kéras: horn) and σμίλευσις (smileusis: carving), or corneal reshaping, is the surgical improvement of the refractive state of the cornea by surgically reshaping it. It is the most common form of refractive surgery. The first usable technique was developed by José Ignacio Barraquer, commonly called "the father of modern refractive surgery."

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