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Early postoperative pain following Epi-LASIK and photorefractive keratectomy: a prospective, comparative, bilateral study. 2/22/2007 Torres LF, Sancho C, Tan B, Padilla K, Schanzlin DJ, Chayet AS.
J Refract Surg. 2007 Feb;23(2):126-32.

 PURPOSE: To compare postoperative pain associated with epi-LASIK versus photorefractive keratectomy (PRK). METHODS: This prospective observer-masked randomized study included 40 eyes of 20 patients with myopia and astigmatism who received epi-LASIK (Moria Epi-K) in one eye and PRK in the contralateral eye. Corneal ablation was done using the NIDEK EC-5000 excimer laser. Patients were seen at days 1, 3, and 6 to rate their pain via three measuring tools: 1) a global subjective rating, 2) a 10-cm visual analog scale, and 3) an 11-point numeric scale of pain. RESULTS: On postoperative day 1, 19 of 20 patients reported pain in both eyes. Using the global subjective rating scale, patients reported more pain for those eyes treated by PRK.

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