During PRK (Photo Refractive Keratectomy) or EpiLASIK the outermost layer of the cornea, called the epithelium is removed. The surgeon then accesses the underlying corneal tissue. You’ll be asked to fixate on a blinking, fuzzy green light, and your doctor will precisely align the laser beam with your eye. When everything is just right, your doctor will activate the excimer laser. Painlessly, computer-controlled excimer laser light pulses will vaporize 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. Following exposure to the excimer laser beam, and correction of the refractive error, the surgeon will place a special contact lens on the eye, to protect the area until the epithelial layer is in place and the eye is healed. This procedure is recommended to candidate with thin corneas and who were deemed unsuitable for any flap related laser vision correction procedures.