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Refractive surgery corrects common vision problems by reshaping the cornea, the eye's outermost layer, to bend light rays to focus on the retina, reducing an individual's dependence on eye glasses or contact lenses. LASIK, or laser-assisted in situ keratomileusis, is the most commonly performed refractive surgery to treat myopia, hyperopia and astigmatism. The first refractive surgeries were said to be the removal of cataracts – the clouding of the lens in the eye – in ancient Greece. This content is intended for Health Care Professionals in the United States.