LASIK is a form of laser-guided surgery to the eye intended to fix troubles with vision. It is carried out by ophthalmologists, who are medical doctors specializing in eye disorders and diseases. LASIK is typically preferred to pRK (photorefractive keratectomy), as it is less painful and requires less time to recover. Prior to LASIK eye surgery, the patient's corneas are evaluated with a computer driven scanner and a corneal map is devised. This process also detects astigmatism and also additional problems in the shape of the cornea. The operating surgeon uses this information to ascertain the amount as well as location of corneal tissue to be removed during the operation. The operation is carried out with the patient awake and alert, nevertheless, the person is often given a minor sedating agent and anesthetic drops for the eyes. The surgeon operates the laser machines, which create all of the cutting. A flap is sliced in the cornea, which is the clear front part of the eye, using a blade or a laser. Subsequently, an excimer laser remodels the cornea. The laser vaporizes tissue without creating harm to the eye. Although relatively uncommon, complicating problems do occur with LASIK or non laser forms of eye surgeries. Just some of the more commonly reported complications of LASIK typically include: infection, light sensitive or dry eyes, under or over correction, fluctuating vision, rings around lights, double vision, and problems with the flap that was created during the surgery. Although LASIK technology is getting better rapidly, scientists have not characterized long-term complications. The procedure is irreversible.

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