Astigmatism

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Astigmatism is also a very common refractive error responsible for blurry vision and often occurs in combination with myopia or hyperopia. The inability of the eye to focus clearly at any distance because of uneven curvatures of the cornea is known as astigmatism. Instead of having uniform curvatures in all meridians, astigmatic corneas have more curvature in one meridian than the others. Corneas with pronounced astigmatism are shaped more like a U.S. football than a round soccer ball.