BACKGROUND: Photorefractive keratectomy (PRK) has been used to treat myopia in human eyes since 1988.METHODS: We evaluated corneal ablation depth after excimer laser myopic photorefractive keratectomy with the Summit Technology Excimed UV200LA laser. Preoperative refraction was: mean 9.58 diopters (D) +/- 2.01, (range 6 to 17), We used ultrasound pachometry (1640 m/sec) in 40 eyes of 33 patients. Mean follow-up was of 49.5 weeks (range 16 to 76).RESULTS: The measurement of the corneal thickness showed a reduction of the initial thickness followed by an inconsistent increase caused by wound healing and tissue proliferation.CONCLUSION: The data showed no direct correlation between diopters of refractive correction and the change in corneal thickness.
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