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- W1494021554 abstract "Purpose: This study, comprising 120 patients (follow-up, 12 to 22 months; mean, 18 months), was designed to evaluate the efficacy and safety of excimer laser photorefractive keratectomy. Methods: Ablation zone diameter (4 mm), ablation rate (0.22 μm/pulse), fluence (180 mJ/cm2), and frequency (10 Hz) were kept constant, and all patients used a standard topical corticosteroid regimen. Results: Overcorrection was followed by regression to a stable refraction by 4 months. At 1 year, 95% and 70%, respectively, of patients undergoing −2.00 diopters (D) and −3.00 D corrections and 40% and 20% of those undergoing −6.00 D and −7.00 D corrections were within ±1.00 D of intended refraction. Anterior stromal “haze”, maximal at 6 months and diminishing thereafter, was detected in 110 patients (92%). However, best-corrected Snellen visual acuity was reduced in only 22 (18%). Good correlation existed between haze and regression (r = 0.68). Night “halos”, due to the relatively small 4-mm diameter ablation zone, were reported by 94 patients (78%) in the early postoperative period, and, at 1 year, 12 (10%) declined treatment of the other eye because of persistence of this problem. Conclusion: Marked individual variation was found after photorefractive keratectomy. However, in low myopia, predictability is “fair”, and the procedure is safe. The authors conclude that excimer laser photorefractive keratectomy holds considerable promise for refractive surgery in the future. Purpose: This study, comprising 120 patients (follow-up, 12 to 22 months; mean, 18 months), was designed to evaluate the efficacy and safety of excimer laser photorefractive keratectomy. Methods: Ablation zone diameter (4 mm), ablation rate (0.22 μm/pulse), fluence (180 mJ/cm2), and frequency (10 Hz) were kept constant, and all patients used a standard topical corticosteroid regimen. Results: Overcorrection was followed by regression to a stable refraction by 4 months. At 1 year, 95% and 70%, respectively, of patients undergoing −2.00 diopters (D) and −3.00 D corrections and 40% and 20% of those undergoing −6.00 D and −7.00 D corrections were within ±1.00 D of intended refraction. Anterior stromal “haze”, maximal at 6 months and diminishing thereafter, was detected in 110 patients (92%). However, best-corrected Snellen visual acuity was reduced in only 22 (18%). Good correlation existed between haze and regression (r = 0.68). Night “halos”, due to the relatively small 4-mm diameter ablation zone, were reported by 94 patients (78%) in the early postoperative period, and, at 1 year, 12 (10%) declined treatment of the other eye because of persistence of this problem. Conclusion: Marked individual variation was found after photorefractive keratectomy. However, in low myopia, predictability is “fair”, and the procedure is safe. The authors conclude that excimer laser photorefractive keratectomy holds considerable promise for refractive surgery in the future." @default.
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- W1494021554 date "1992-08-01" @default.
- W1494021554 modified "2023-10-18" @default.
- W1494021554 title "Excimer Laser Photorefractive Keratectomy" @default.
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- W1494021554 doi "https://doi.org/10.1016/s0161-6420(92)31821-4" @default.
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