Astigmatism (medicine) - Definition

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Astigmatism is an anomaly of the optical system, occurring in the cornea or lens, occasionally both, that causes an inability to obtain a focused image. A cataract may lead to astigmatism. Persons with astigmatism have reduced visual acuity and blurred vision, at no matter what distance, and confuse vertical, diagonal, and horizontal lines. Astigmatism is often tied to myopia and hyperopia. Wearing glasses or contact lenses can correct astigmatism, as well as laser surgery.