Laser vision correction changes the focus of the eye by reshaping the cornea (the clear window at the front of the eye) to improve vision without needing glasses of contact lens. There are a number of different methods but the final visual results are the same but with slightly different healing and visual recovery times, and future retreatment options.
The main two methods using the Excimer laser are flap based (LASIK) and surface based treatments (transPRK or PRK, also referred to as LASEK); and can correct shortsightedness (myopia), longsightedness (hyperopia) and astigmatism.