PRK is an acronym which stands for PhotoRefractive Keratectomy (PRK). PRK was the first approved procedure for laser vision correction, before the development of LASIK. During PRK surgery the laser is applied to the surface of the cornea after gentle removal of the protective outer cells (epithelium). A corneal flap is not created as in the LASIK procedure. PRK uses the same advanced CustomVue laser technology as LASIK, and the results are nearly identical to LASIK.

CustomVue PRK is an excellent alternative for many who cannot have LASIK surgery due to a thin or irregular cornea, or other eye conditions. Because the protective outer cells of the cornea must be removed to perform the procedure, there is generally more discomfort afterward as the surface heals. Recovery of vision also proceeds somewhat more slowly than with LASIK, but the final results are nearly identical.