PRK is refractive surgery that can be used with patients who may not qualify for LASIK surgery. PRK is performed with an excimer laser, which uses a cool ultraviolet light beam to precisely remove ("ablate") very tiny bits of tissue from the surface of the cornea in order to reshape it. When you reshape the cornea in the right way, it focuses light more precisely into the eye and onto the retina, providing clearer vision than before.
Both myopia and hyperopia people can benefit from PRK. With nearsightness, the goal is to flatten the too-steep cornea; with farsightness, a steeper cornea is desired. Excimer lasers can also correct astigmatism by smoothing an irregular cornea into a more normal shape.
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