Surgery Overview

Photorefractive keratectomy (PRK) and laser epithelial keratomileusis (LASEK) for farsightedness use a laser to reshape the cornea so that light is refocused on the retina. The laser reshapes the cornea accurately without damaging nearby tissues. No surgical cut is needed. Either procedure may be used to correct farsightedness and astigmatism at the same time.

These procedures can be done on an outpatient basis in a surgeon's office or same-day surgery center. With PRK, surface skin cells of the cornea are removed, and a laser is used to reshape the cornea. The whole procedure, including preparation and surgery, takes about 20 minutes.

With LASEK, the surface layer of the cornea is loosened and pushed to the side. After the laser reshapes the cornea, the surface layer is placed back over the cornea.

PRK and LASEK are sometimes called surface ablation.

What To Expect After Surgery

You will wear an eye shield, a bandage, or special contact lens for 2 to 3 days after surgery. And your doctor will prescribe eyedrops to reduce inflammation and the risk of infection. You may need to use eyedrops for several months after surgery. Several follow-up visits are needed.

The eye can be quite painful for 2 to 3 days. Your vision will be reduced for several days after surgery, until the surface skin cells heal. Recovering from LASEK surgery may not be as painful as with the PRK procedure.

Why It Is Done

PRK and LASEK are similar surgeries and are done for similar reasons.

The American Academy of Ophthalmology considers both surgeries safe and effective for mild to moderate farsightedness. PRK has been approved for use in the United States in people age 21 and older who have mild to moderate farsightedness.¹

PRK or LASEK may not be appropriate for people who have more severe farsightedness (high hyperopia), because the results are harder to predict and complications are more likely.

Both are elective, cosmetic procedures, done to correct farsightedness in otherwise healthy eyes.

These procedures may not be done during pregnancy, because pregnancy may interfere with the healing of the cornea.

How Well It Works

PRK and LASEK effectively reduce mild to moderate farsightedness. Little is known about the long-term effectiveness of either procedure.

In the short term, PRK has proved effective in correcting mild to moderate hyperopia.

Risks

One problem commonly associated with PRK is clouded vision (sometimes referred to as haze). Most eyes treated with PRK have some clouding of the cornea as a result of healing. Your doctor may prescribe a medicine that will help take away the haze. But sometimes the haze won't go away.