REFRACTIVE PROCEDURES

PRK: The Original Laser Eye Surgery

It may be hard to believe these days, when everything is “LASIK this” and “LASIK that,” but PRK (photorefractive keratectomy) used to be the most common refractive surgery procedure. Both are grouped under the umbrella “laser eye surgery,” but each is a little different when it comes to advantages and disadvantages. LASIK patients have less discomfort and obtain good vision more quickly (with PRK improvement is gradual and over a few days or even months), but many surgeons prefer PRK for patients with larger pupils or thin corneas.

PRK was invented in the early ’80s. The first FDA approval of a laser for PRK was in 1995, but the procedure was practiced in other countries for years. In fact, many Americans had the surgery done in Canada before it was available in the U.S.

WHO CAN BENEFIT

Both nearsighted and farsighted people can benefit from PRK. With nearsighted people, the goal is to flatten the too-steep cornea; with farsighted people, a steeper cornea is desired. Also, excimer lasers can correct astigmatism, by smoothing an irregular cornea into a more normal shape.

HOW DOES IT WORK?

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 works better to focus light into the eye and onto the retina, providing clearer vision than before.

PRK Animation

PRK BENEFITS