Refractive Surgery: PRK
PRK (photorefractive keratectomy) is a procedure to reshape corneal tissue to help you see better without glasses or corrective lenses. This procedure uses an excimer laser. This laser produces a concentrated beam of cool ultraviolet (UV) light. Each pulse of the laser can remove a tiny portion of corneal tissue. PRK can be used to treat low to moderate myopia, hyperopia, and astigmatism.
What to Expect
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Before treatment, you may be given medication to help you relax.
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Eyedrops numb your eyes. A device is used to keep your eyes open.
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A small surgical tool or the laser is first used to remove the central portion of the epithelium. Laser treatment lasts for 10–90 seconds.
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After laser treatment, you will wear a contact lens as a bandage for a few days. This protects the cornea as it heals.
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For a few days after the procedure, your vision may seem worse. It should begin to improve in about 5 days, and become stable in about 6 months.
Cons of PRK
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Mild to moderate pain after surgery
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Longer vision recovery than LASIK
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May need to use eyedrops for 3 months or longer
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Risk of corneal scarring or haze
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Risk of temporary or permanent dry eye
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Risk of night vision problems, such as halos, glare, or starbursts
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Risk of undercorrection or overcorrection
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Risk of loss of best corrected vision
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Pros of PRK
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No risk of flap complications
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Better for patients with thin corneas, previous glaucoma surgery, mild corneal scars, or other cornea problems
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Publication Source:
Chalita MR, Ophthalmology Clinics of North America, 17(2), Correlation of aberrations with visual acuity and symptoms, Jun 2004, pp 135-42, v-vi
Online Medical Reviewer:
Hammersmith, Kristin, MD
Date Last Reviewed:
8/26/2004
Date Last Modified:
6/23/2003