During LASIK an advanced automated device is used to create a thin flap 90 to 120 microns of tissue on the cornea, the clear front window of the eye. The flap is then hinged back, out of the way. You’ll be asked to fixate on a blinking, fuzzy green light, and your doctor will precisely align the excimer laser vision correction beam with your eye. When everything is just right, your doctor will activate the excimer laser. Painlessly, computer-controlled laser light pulses will remove microscopic amounts of tissue, gently re-shaping the cornea. The pattern of laser treatment is determined by a sophisticated program and based on the detailed measurements, that were taken during your pre-operative examination. Before you know it your procedure is over, and the surgeon will gently reposition the flap, smooth it with a special medical sponge, and allow it to dry for a short time.