LASIK

LASIK Laser-assisted in situ keratomileusis, a kind of laser eye surgery that is designed to change the shape of the cornea to correct vision defects including nearsightedness (myopia), farsightedness (hyperopia), and astigmatism. LASIK is an outpatient procedure that is done with numbing eye drops and takes only minutes to perform. LASIK is similar to photorefractive keratectomy, the major difference being the way that the middle layer of the cornea is exposed before it is vaporized with the laser. In PRK, the top layer of the cornea, called the epithelium, is scraped away to expose the middle layer underneath. In LASIK, a flap is cut in the middle layer and the flap is folded back.