LASIK is a type of laser-guided eye surgery designed to cure or improve disorders with vision. The surgical procedure is performed by ophthalmologists, who are physicians or MDs specializing in eye disorders. LASIK is typically preferable to photorefractive keratectomy (PRK), as it is much less painful and requires less time to heal completely. Prior to having LASIK surgery, the patient's corneas are evaluated with a computerized scanning device and a corneal map is devised. This stage of the procedure also discovers astigmatism and also additional problems in the cornea's shape. The eye surgeon uses this information to ascertain the amount as well as location of corneal material to be removed during the surgery. The operation is performed while the person is awake and functional, however, the person is typically given a mild sedating agent and anesthetizing drops in the eyes. The surgeon operates the lasers, which do all of the cutting. A flap is cut in the cornea using a blade or laser. Subsequently, an excimer laser is used to remodel the cornea. The laser vaporizes tissue without creating injury to the eye. Although usually uncommon, damaging complications can occur with LASIK or any form of eye surgeries. A few of of the more regularly reported complications of LASIK typically include: infection, light sensitive or dry eyes, under or over correction, fluctuating vision, starbursts or halos around lights, double vision, and disorders with the flap that was created during the surgery. Although LASIK technology is improving quickly, research has not characterized long-term or permanent complications. The surgical procedure is irreversible.

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