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9 Jan 2008

Astigmatism

"Astigmatism is one of the most common vision problem.
It may accompany nearsightedness or farsightedness. Usually it is caused by an irregularly shaped cornea (called corneal astigmatism). But sometimes it is the result of an irregularly shaped lens, which is located behind the cornea; this is called lenticular astigmatism. Either kind of astigmatism is usually corrected with eyeglasses or contact lenses"

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