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astigmatism medical definition
noun
A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision. Also called astigmia.
Related Forms:
- astigmatic adjective & n.
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astigmatism
Top: astigmatic vision
Bottom: corrected vision
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