LASIK (laser-assisted in situ keratomileusis) is the most commonly performed laser eye surgery for treating farsightedness (hyperopia), nearsightedness (myopia) and astigmatism. The LASIK procedure reshapes the cornea, enabling light to enter the eye and to be properly focused onto the retina.

Prior to surgery, a piece of equipment is often used to determine the curvature of the front surface of the eye and create a map of the cornea. The patient’s eye is positioned under the laser where a tool is used to keep the eyelids open. The surgeon then uses an ink marker to mark the cornea before creating the flap. A suction ring is applied to the front of the eye to prevent eye movements.

After the corneal flap is formed, the surgeon uses a computer to adjust the laser to the specific prescription. The patient will look at a target light for a short time, while the surgeon observes the eye through a microscope, as the laser sends pulses of light to the cornea. The laser light pulses painlessly reshaping the cornea.