The Femto-LASIK procedure

PRK (photorefractive keratectomy)

11 May 2015 | LASER SURGERY | Цитата

PRK (photorefractive keratectomy) is a type of refractive surgery to correct myopia (nearsightedness), hyperopia (farsightedness) andastigmatism.

PRK was the first type of laser eye surgery for vision correction and is the predecessor to the popular LASIK procedure. Though PRK recovery takes a bit longer than recovery from LASIK eye surgery, PRK is still commonly performed and offers advantages over LASIK for some patients. Like LASIK and other types of laser eye surgery, PRK works by reshaping the cornea using an excimer laser, allowing light entering the eye to be properly focused onto the retina for clear vision.

Since 2005 PRK procedure has been performed in our Center

The main difference between PRK and LASIK is that in LASIK surgery a thin, hinged flap is created on the cornea to access the treatment area, whereas in PRK the cornea's entire epithelial (outer) layer is removed to expose the area and no flap is created. For both PRK and LASIK, the excimer laser then sculpts thestromal layer of the cornea to correct your refractive error.

PRK vs. LASIK The final results of PRK surgery are comparable to LASIK outcomes, but initial PRK recovery is slower because it takes a few days for new epithelial cells to regenerate and cover the surface of the eye.

PRK does, however, offer some distinct benefits. Because PRK surgery does not create a corneal flap (which contains both epithelial and the deeper stromal tissues), the entire thickness of the underlying stroma is available for treatment.

This is of particular benefit if the cornea is too thin for LASIK or if you have undergone LASIK previously and therefore have a thinner residual cornea. There also is no risk of flap complications, and the risk of removing too much of the cornea with the excimer laser is reduced.

While currently LASIK is used more often for visual correction surgery, PRK may be the best procedure in certain circumstances.

Long-Term Results of PRK

PRK laser eye surgery has been performed overseas since the 1980s and in the United States since 1995 and has a very high success rate. It has undergone significant advancements during this time and remains the treatment of choice in certain circumstances.

PRK and LASIK results are similar. Most people achieve 20/20 vision after PRK surgery, and nearly all patients achieve 20/40 visual acuity or better. Some patients may still need to wear eyeglasses or contact lenses, but the prescription will be significantly lower than before the procedure. Post-operative PRK and LASIK complications are rare and can include infection and glare (starbursts or halos that are most noticeable when you're viewing lights at night, such as while driving).

While LASIK is by far the most popular laser eye procedure today, it's important to follow the guidance and judgment of your eye surgeon to determine whether PRK or LASIK is best for your individual circumstances.

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