Other Free Encyclopedias » 21st Century Webster's Family Encyclopedia » 21st Century Webster's Family Encyclopedia - Arcturus to Augur

Astigmatism

Astigmatism, defect of vision caused by irregular shaping in the cornea or lens. In astigmatism, light rays do not converge evenly, some focusing behind the retina, some before it, others on it. It can be corrected by glasses or contact lenses.

See also: Eye.

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