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PRK is a useful alternative to LASIK for patients who have thin corneas. In addition, some doctors believe PRK to be more effective than LASIK for mild to moderate nearsightedness, though clinical data on this suggest there is not much difference.
Otherwise, the criteria for PRK are the same as those for other forms of refractive surgery. People who have unstable eyes (particularly those under 18), women who are pregnant or nursing, and those with certain medical conditions are not considered good candidates for successful PRK eye surgery. A good surgeon will meet with you to answer any questions you have, but also to test your eyes and take your medical history, before you schedule your surgery.