LASIK, or laser-assisted in situ keratomileusis, is the most commonly performed laser eye surgery to treat myopia (nearsightedness), hyperopia (farsightedness) and astigmatism. Like other types of refractive surgery, the LASIK procedure reshapes the cornea to enable light entering the eye to be properly focused onto the retina for clearer vision. In most cases, laser eye surgery is pain-free and completed within 15 minutes for both eyes.