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Astigmatism is 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.

Mixed astigmatism or irregular astigmatism describes the unequal curvature of the cornea in which one meridian is myopic and the other is hyperopic. Mixed astigmatism causes distorted vision at both near and far distances because of the way in which distortions occur on different portions of the eye’s surface.

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