LASIK is a form of laser surgery to the eye designed to fix troubles with sight. LASIK is performed by ophthalmologists, who are medical doctors specializing in diseases and disorders of the eye. LASIK is ordinarily preferred to photorefractive keratectomy (PRK), as it is less pain-producing and requires less time to heal completely. Prior to having LASIK surgery, the patient's corneas are examined with a computerized scanning device and a map of the cornea is made. This stage of the procedure also spots astigmatism as well as additional deviations in the cornea's shape. The operating surgeon uses this information to ascertain the amount and location of corneal tissue to be removed during the surgery. The surgery is carried out while the person is awake and functional, however, the person is often given a modest sedating drug and anesthetizing eye drops. The surgeon operates the lasers, which create all of the cutting. A flap is cut in the cornea, which is the clear front part of the eye, using a laser or a blade. Afterwards, an excimer laser remodels the cornea. The laser destroys tissue without inducing damage or injury. Although usually uncommon, damaging complications do occur with LASIK or any eye surgeries. A number of the more commonly reported complications of LASIK are: infection, dry or light sensitive eyes, over or under correction, fluctuating vision, starbursts or halos around lights, doubled vision, and difficulties with the flap produced during the surgical procedure. Although LASIK technology is improving rapidly, scientists have not characterized long-term complicating problems. The lASIK procedure cannot be reversed.

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