Astigmatism

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"Astigmatism." 30 August 2007. HowStuffWorks.com. <http://reference.howstuffworks.com/astigmatism-encyclopedia.htm> 09 July 2008.

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Astigmatism, uh STIHG muh tihz uhm, is a visual defect in which both nearby and distant objects appear blurred. It is usually found in both eyes. In most cases, astigmatism is caused by the shape of the cornea.

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Astigmatism

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