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Astigmatism is an eye disorder in which the cornea (the clear tissue covering the front of the eye) is abnormally curved, causing out-of-focus vision.
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.
An astigmatism makes it difficult to see fine details, either close-up or from a distance.
Glasses or hard contact lenses will correct astigmatism. Soft contact lenses do not work as well.
Severe astigmatism can be treated with surgery.
Vision is usually normal with the correct glasses or contact lenses.