Reference Terms
from Wikipedia, the free encyclopedia

Astigmatism (eye)

In ophthalmology, astigmatism is a refraction error of the eye in which there is a difference in degree of refraction in different meridians.

Note:   The above text is excerpted from the Wikipedia article "Astigmatism (eye)", which has been released under the GNU Free Documentation License.
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Science News
July 31, 2015

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updated 12:56 pm ET