For nearsighted people, certain refractive surgery techniques will reduce the curvature of a too-step cornea so that the eye's focusing power is lessened. Due to a longer eye or steep corneal curve, images that are focused in front of the retina are pushed closer to or directly onto the retina following surgery. Farsighted people will have refractive surgery procedures that achieve a steeper cornea to increase the eye's focusing power. Due to a short eye or flat cornea, images that are focused beyond the retina will be pulled closer to or directly onto the retina after surgery. Astigmatism can be corrected with refractive surgery techniques that selectively reshape portions of an irregular cornea to make it smooth and symmetrical. The result is that images focus clearly on the retina rather than being distorted due to light scattering through an irregularly shaped cornea.
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