This type of laser eye surgery can help if you are nearsighted, farsighted, or have astigmatism. It works best if your eye problem is mild or moderate. All laser vision correction surgeries work by reshaping your cornea, the clear front part of your eye. Think of it like a windshield -- light travels through it just and  focuses on the retina in the back of your eye.

During PRK, an eye surgeon uses a cool pulsing beam of ultraviolet light on the surface of your cornea. LASIK, another type of laser surgery, works underneath your cornea.

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