What's the difference between PRK, LASIK, and RK?

You may have heard about PRK, which stands for Photorefractive Keratectomy, the medical name for the laser procedure. PRK and LASIK (Laser in-situ Keratomileusis) both use the VISX Laser System to remove corneal tissue in order to reshape the cornea. In the PRK procedure, the laser works on the surface of the cornea.

With LASIK, the surgeon first creates a flap on the cornea and then uses the laser for treatment below the corneal surface. RK (Radial Keratotomy) is a non-laser procedure, in which the surgeon uses a diamond blade to make a series of radial cuts into the cornea. Both LASIK and PRK are approved by the U.S. Food and Drug Administration as "safe and effective".

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