or PRK or LASEK, somehow, laser eye surgery is for the correction of refractive errors in people ... the camera and astigmatic used. In this action to shape the cornea and correct diagnostic, refractive, similar to LASIK of the excimer laser used; but, unlike Lasik, does not require the use of the device and remove the top layer of the cornea. but also for vision correction surface of the cornea (after scraping the cells of the surface or epithelium) directly, the laser can be. PRK on people when the cornea is thin, or disorder, the cornea, another specific. is more appropriate. PRK in the people, army, etc. athletes, especially martial arts, and some other jobs more suitable. PRK in 1995 for the correction of myopia, and in 1998, to correct hyperopia approved by the FDA (Food and Drug Administration) and was very low risk. Snuggly in the action layer (the flap) is removed is not complications related to the removal of the flap does not exist. In PRK, the removal of tissue from the center of the cornea. the slope of the curvature, it has less myopia can be corrected. To correct hyperopia, by removing the tissue from the part of the peripheral cornea., the slope of the curvature of the central, it is more and hyperopia can be corrected. To correct astigmatism, etc. of the cornea, so, given that the spherical shape turns.