Refractive surgery is a way to correct or improve your vision if you have a refractive error, such as nearsightedness (myopia), farsightedness (hyperopia), astigmatism, or presbyopia. The cornea, or clear, circular dome at the front of the eye, can be reshaped surgically to repair or adjust your eye's ability to focus. In some treatments, a lens is implanted inside your eye. The most popular method of refractive surgery is called LASIK (laser-assisted in situ keratomileusis), which involves reshaping the cornea with a laser. Certain refractive surgery procedures might diminish a cornea's excessively steep curvature in nearsighted patients, hence reducing the eye's focusing power. Following surgery, images that are concentrated in front of the retina because of a longer eye or a sharp corneal curve are pushed up against or straight onto the retina. People who are farsighted will have refractive surgery techniques that result in a steeper cornea to improve the eye's focusing ability. After surgery, images that are focused outside of the retina because of a short eye or flat cornea will be brought close to or right onto the retina.
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