|  | | | PRK (Photorefractive Keratectomy) |  |
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PRK is a vision-correction procedure in which an excimer laser is used to reshape the curvature of the cornea to correct myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. PRK with VISX excimer laser was approved by FDA in 1996 after the completion of trials that began in 1989.
Procedure Description:
During PRK, the top layer of the cornea called the epithelium is removed to expose the cornea's mid-section, the stroma. Next, excimer laser is applied to reshape the stroma. Special contact lenses and eye drops are used to help speed healing and minimize discomfort. Healing responses vary from patient to patient.
What to Expect:
Without the help of glasses, the results at 12 months after surgery were:
* 94% mildly nearsighted eyes could see 20/40 or better;
* 91% mildly nearsighted eyes with astigmatism could see 20/40 or better;
* 90% highly nearsighted eyes without or without astigmatism could see 20/40 or better; and
* 95% moderately farsighted eyes could see 20/40 or better.
Preprocedure:
You will need to have a pre-surgical examination to determine if your eye is healthy and suitable for PRK. This will include a complete physical and eye history, and thorough examination of both eyes. In addition, computerized mapping of your cornea will be done to determine if it is smooth and properly shaped.
Before the surgery, please tell your doctor whether you take any medications or have any allergies. Also, talk with your doctor about eating or drinking immediately before the surgery. You should also arrange for transportation since you must not drive immediately after the surgery. You may resume driving only after receiving permission from your doctor.
Postprocedure:
You will be mildly sensitive to light and have the feeling that something is in your eye for the first few days. Sunglasses may make you more comfortable during this time.
Your vision should become stable within the first several weeks after surgery. However, you may experience some small changes (for example, improvement or worsening of your vision) that may occur up to six months or more after the surgery.
Mild haze or cloudiness is typically seen in the cornea following PRK but usually does not affect your vision. This haze tends to decrease over time and usually completely disappear over a 12- to 24-month period. |
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Dr. Jeehee Kim: PRK
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