J Korean Ophthalmol Soc > Volume 55(11); 2014 > Article
Journal of the Korean Ophthalmological Society 2014;55(11):1625-1630.
DOI: https://doi.org/10.3341/jkos.2014.55.11.1625    Published online November 15, 2014.
Comparison of LASIK Mode Ablation and PRK Mode Ablation in LASEK Using MEL-80 Excimer Laser.
Youngdon Kim, Damho Lee, Haksu Kyung
1Department of Ophthalmology, National Medical Center, Seoul, Korea.
2Vision Eye Center, Seoul, Korea. damholee@naver.com
MEL-80으로 라섹수술 시 라식 모드 절삭과 PRK 모드 절삭의 임상적 유용성 비교
김영돈1⋅이담호2⋅경학수1
Department of Ophthalmology, National Medical Center1, Seoul, Korea
Vision Eye Center2, Seoul, Korea
Abstract
PURPOSE
We compared laser assisted in situ keratomileusis (LASIK) mode and photorefractive keratectomy (PRK) mode ablation methods in laser subepithelial keratomileusis (LASEK) surgery using the MEL-80 excimer laser. METHODS: All patients were followed up for a minimum of 1 year. The PRK mode group consisted of 46 eyes of 23 patients and the LASIK mode group consisted of 97 eyes of 56 patients. The central corneal thickness (CCT), ablation thickness, manifest refractive error and uncorrected visual acuity were compared preoperatively, 1 month and 1 year postoperatively. Spherical equivalent (SE) of cycloplegic refraction at postoperative 1 month and the uncorrected visual acuity (UCVA) ratios of 1.0 or better at postoperative 1 year were compared between the two groups to evaluate clinical efficacy. RESULTS: The SE of refractive error, CCT and target corneal ablation thickness of the two groups were not significantly different preoperatively. The PRK mode group obtained an actual ablation mean thickness of 82.8% of the target and the LASIK mode group obtained an actual ablation mean thickness of 94.1% of the target at postoperative 1 month. In each group, a statistically significant difference was observed between the actual corneal ablation thickness and target corneal ablation thickness. In the PRK mode group, the mean SE of postoperative 1 month cycloplegic refraction was +0.24 +/- 0.47 D and in the LASIK mode group, +0.87 +/- 0.54 D, indicating a statistically significant difference between the two groups. One year postoperatively, the UCVA ratios of 1.0 or better were 83% in the PRK mode group and 96% in the LASIK mode group, showing a statistically significant difference between the two groups. However, SE of manifest refractive error and CCT in the two groups were not statistically different at postoperative 1 year. CONCLUSIONS: The LASIK mode ablation method showed better results than the PRK mode ablation method in postoperative UCVA prognosis after LASEK surgery using the MEL-80 excimer laser.
Key Words: Corneal ablation thickness;LASEK;LASIK mode ablation;MEL-80 excimer laser
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