LASEK is a new excimer laser procedure that combines the advantages of PRK and LASIK for patients with high numbers of corneal thickness. This method involves creating a corneal epithelial flap approximately 50-80um thick, flipping it open, making excimer laser cuts underneath it, and then resetting the epithelium. It is characterized by a slightly heavier postoperative reaction than LASIK, with eye pain overnight, photophobia and tearing for about 1 day, and a slower recovery of vision, which generally improves significantly about half a month after surgery, and takes 2-3 months of postoperative medication. However, the advantage is that it is less traumatic to the cornea in the long run and more resistant to external forces. Lasek is highly recommended for patients with myopia of 500 degrees or less.