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PRK is quite similar to LASIK, Photorefractive keratectomy (PRK) is a procedure in which the surface of the cornea is reshaped by the surgeon using the Excimer laser. The main difference between PRK and LASIK is that with PRK there is no corneal flap that is cut, instead; the laser beam is applied directly to the surface of the eye to reshape the cornea. PRK is less frequently used because of the development of LASIK, but in some individual cases, PRK may still be the procedure of choice.
Even though the initial healing may take several days longer than that of LASIK, the long-term results are the same. In general, PRK patients will have a somewhat slower recovery of their best vision than LASIK patients. Studies at the 6 month postoperative visit in LASIK and PRK patients show essentially equivalent results with similar ranges of nearsightedness.