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Before the lasik eye surgery procedure, a sedative may be given. Anesthetic and antibacterial drops are also placed in the eye, and the doctor retracts the eyelids using titanium eyelid retractors. During the LASIK eye surgery procedure, the lasik surgeon will use a special machine called a microkeratome to cut the cornea so that there is a flap of cornea which is peeled back and held in place for the rest of the procedure. Suction is first applied to the eye ball during the first phase so that the cornea flattens, making it possible to cut the flap of cornea. Then, a computer-controlled laser is used to shape the cornea as needed to correct vision. The doctor uses a mathematical calculation called the Munnerlyn formula to determine what the future eyesight will be. The flap is then placed back over the eye. The reshaping of the cornea changes how the eye refracts light, and therefore, changes vision. The entire procedure takes approximately ten minutes. Read more about lasik.