PRK (Photorefractive Keratectomy)

PRK (Photorefractive Keratectomy) is a type of laser eye surgery which is similar to Lasik. However, PRK requires less instrumentation and avoids the creation of the flap. Comparing to Lasik, it is more discomfort and requires longer recovery period. PRK was invented in 1980s and was performed in Canada prior to its first FDA approval in 1995.

PRK procedure is performed using excimer laser, a cool light ultraviolet beam to remove tissues from the surface of the cornea. After the cornea is reshaped in a proper way, it will be able to focus the light into the eye and onto the retina. As a result, the defective eyesight will have then a clearer and better vision. For the correction of myopia, the too-steep cornea is flattened; for the case of hyperopia, a steeper cornea is created.

Who is the best candidate for PRK? Patients whose cornea may be too thin to make the corneal flap and whose pupil may be too large for Lasik are best to undergo PRK procedure. This procedure can be used for nearsightedness, farsightedness as well as astigmatism.

Before the surgery, it is important to have a thorough check-up first with the medical center or the doctor’s clinic who will operate the eye surgery. During the check-up, they will look into your medical history and perform an eye examination. The examination will identify the thickness of the cornea, refraction and pupil dilation. After the result of the test and medical history is evaluated, the doctor will advise you the best option to correct your eye problem. If you are contact lens users, the doctor might advise you to stop using the lenses for at least a minimum of three weeks prior to the surgery.

During the surgery, eye drops is used to anesthetize the eyes. You won't feel pain during the whole procedure which only takes a few minutes. You are awake all the time. You will be advised not to use any hair accessories and make-up on the day of surgery. This will ensure the absence of any physical hurdles during the laser operation.

After the surgery, patients can go home after a bit rest at the clinic. Most patients can return to the majority of their normal daily routines in one to three days. It is important to have good rest and immediately call your doctor if there is any problem. You should also avoid rubbing your eye and doing strenuous exercise for at least a week. The recovery stage is very important as it will affect your vision if anything goes wrong.

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