In this method dilute alcohol is used to separate the epithelium from the corneal wall. Then a laser beam photoablates the cornea to change its curvature, exactly as in PRK. The corneal epithelium is then repositioned. The procedure takes a few minutes for each eye. At the end of the procedure, the surgeon puts a contact lens to help the epithelium regeneration within the next three to four days. The operation is performed under topical anesthesia with drops and is painless.