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nearsightedness (myopia), farsightedness (hyperopia), and astigmatism.

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The most common refractive errors are astigmatism, hyperopia (farsightedness) and myopia (nearsightedness). Astigmatism is a condition in which an abnormal curvature of the cornea can cause two focal points to fall in two different locations, making objects up close and at a distance appear blurry.
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