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Astigmatism
Definition:
Astigmatism is a condition in which the cornea of the eye is asymmetrically curved, causing out-of-focus vision. Causes, incidence, and risk factors:
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The cause of astigmatism is unknown. It is usually present from birth, and often occurs together with nearsightedness or farsightedness. A minor degree of astigmatism is considered normal and does not require correction. Astigmatism is very common.
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