LASIK, one of a few types of laser eye surgery, is performed with an excimer laser after the top membrane of the cornea, the clear cap of the eye, has been sliced and peeled back. The laser removes tissue from within the body of the cornea, reshaping it and putting the eye into focus. It is a very successful surgery, provided the patient is a good candidate. A patient should not have the procedure if their cornea is too thin, they expect absolutely perfect vision, or have tendency to form large prominent scars on their skin.