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Comparison of Photorefractive Keratectomy and Laser in situ Keratomileusis for Myopia of -6 D or Less Using the Nidek EC-5000 Laser
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Comparison of Photorefractive Keratectomy and Laser in situ Keratomileusis for Myopia of -6 D or Less Using the Nidek EC-5000 Laser
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Comparison of Photorefractive Keratectomy and Laser in situ Keratomileusis for Myopia of -6 D or Less Using the Nidek EC-5000 Laser
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Journal Article
Comparison of Photorefractive Keratectomy and Laser in situ Keratomileusis for Myopia of -6 D or Less Using the Nidek EC-5000 Laser
2000
Overview
ABSTRACT PURPOSE: We compared the efficacy, predictability, and safety of photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) for the surgical correction of low and moderate myopia. METHODS: A retrospective study was performed to evaluate uncorrected and spectacle-corrected visual acuity, and manifest refraction 1 year after PRK or LASIK. All procedures were done using an automatic microkeratome (Chiron Ophthalmic) and the Nidek EC-5000 excimer laser. RESULTS: PRK was performed in 75 eyes of 45 patients and LASIK in 133 eyes of 77 patients. Mean age for PRK patients was 32.8 years (range, 18 to 52 yr) and LASIK patients was 29.6 years (range, 18 to 49 yr). Mean preoperative spherical equivalent refraction for PRK patients was -3.28 D (range, *1.00 to -6.00 D) and LASDI, -3.86 D (range, -1.00 to -6.00 D). One year after surgery, mean spherical equivalent refraction for Group 1 (baseline, -1.00 to -3.00 D) PRK eyes was -0.18 ± 0.61 D (range, -1.50 to +0.75 D) and for LASIK eyes, -0.08 ± 0.61 D (range, *1.50 to +1.62 D), with no statistically significant difference. For Group 2 eyes (baseline, -3.E5 to -6.00 D), mean spherical equivalent refraction for PRK eyes was -0.44 ± 0.87 D (range, -2.00 to +2.12 D) and for LASDI eyes, -0.09 ± 0.83 D (range, -1.50 to +1.75 D), with no statistically significant difference. The antilogarithm of the mean UCVA (antilogUCVA) in Group 1 for PRK was 0.79 ± 0.21 (20/25) and for LASDI was 0.87 ± 0.19 (20/23), with no statistically significant difference. The antilogUCVA in Group 2 for PRK eyes was 0.70 ± 0.24 (20/28) and for LASDI eyes was 0.83 ± 0.18 (20/24), with a statistically significant difference (0.7 vs. 0.83, P < .005). The percentage of eyes with a postoperative UCVA>20/40 in Group 1 for PRK was 91.5% (38 eyes) and for LASDI was 95% (50 eyes) (no statistically significant differenee), and in Group 2 for PRK eyes, it was 82% (27 eyes) and 97.5% (78 eyes) for LASDI (statistically significant difference, P < .05). CONCLUSION: PRK and LASDI with the Nidek EC-5000 excimer laser are effective and safe for correcting low to moderate myopia, but LASDI eyes showed better results for moderate myopia in terms of uncorrected visual acuity. [J Refract Surg 2000;16:711-715]
Publisher
Slack,SLACK INCORPORATED
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