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Patients with myopia, or nearsightedness, have steep curvature in one or both corneas; they can focus on nearby objects, but distant objects appear blurry. For hyperopic or farsighted patients, shallow corneal curvature causes nearby objects to appear blurry while objects in the distance are clear. Astigmatism causes objects that are close or at a distance to appear blurry or doubled. Most people have some degree of astigmatism, which often occurs in combination with myopia or hyperopia.
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What are myopia, hyperopia and astigmatism?
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