PRK, photorefractive keratectomy:
This was the first corneal laser surgery developed, and recent innovations have improved patient comfort during and after PRK. Results are similar to LASIK within three to six months post-surgery.
PRK may be recommended for original or retreatment surgery when the cornea is considered too thin for LASIK, when there are concerns about creating a corneal flap, or when the surgeon considers it safer and more effective for a particular patient for other reasons.
PRK can correct myopia, hyperopia and astigmatism.
The procedure: The difference from LASIK is that a corneal flap is not created, but instead the top, or epithelial, layer is removed (or moved aside) before treating the stromal layer with the excimer laser.
SOURCES for Additional Useful and Reliable Information
The United States Food and Drug Administration. Center for Devices and Radiological Health. LASIK. http://www.fda.gov/cdrh/lasik
Ophthalmic Mutual Insurance Company. Informed Consent Guidelines.
American Academy of Ophthalmology. www.aao.org
American Academy of Ophthalmology. Patient Education. LASIK.
Eye Surgery Education Council, established by the American Society for Cataract and Refractive Surgery. LASIK.