PRK - Photorefractive Keratectomy is a vision correction procedure that is considered primarily for patients with thinner corneas. PRK uses the same excimer laser technology that is used in LASIK, however, no corneal flap is made.  The surgeon manually removes the thin top corneal layer (the epithelium). The laser is applied and then a protective bandage contact lens is inserted. The contact lens is typically left in the eye for 3 to 4 days and removed by your doctor during a post-operative visit.