LASIK is an acronym for Laser-assisted in situ keratomileusis. This laser procedure permanently changes the shape of the cornea thus correcting the refractive error, the clear covering of the front of the eye, using an excimer laser.
Lasik surgeon uses either a surgical tool called a microkeratome or a femtosecond laser to create a thin, circular flap in the cornea. The surgeon then folds back the hinged flap to access the underlying cornea and removes some corneal tissue using an excimer laser.
This highly specialized laser uses a cool ultraviolet light beam to remove microscopic amounts of tissue from the cornea to reshape it so it more accurately focuses light on the retina for improved vision. After the laser reshapes the cornea, the flap is then laid back in place, covering the area where the corneal tissue was removed. Then the cornea is allowed to heal naturally. Laser eye surgery requires only topical anesthetic drops, and no bandages or stitches are required.
Advantages of LASIK are