Safety and efficacy of undersurface ablation of the flap for regression after LASIK
10.3980/j.issn.1672-5123.2014.06.38
- VernacularTitle:角膜瓣背面基质切削治疗LASIK术后屈光回退的安全性和有效性
- Author:
Ke-Li, LONG
;
Su-Yan, LI
- Publication Type:Journal Article
- Keywords:
cornea flap;
undersurface ablation;
laser in situ keratomileusis;
regression;
safety;
efficacy
- From:
International Eye Science
2014;(6):1119-1121
- CountryChina
- Language:Chinese
-
Abstract:
AIM: To investigate the safety and efficacy of undersurface ablation of the flap ( UAF ) for laser in situ keratomileusis ( LASIK ) retreatment in eyes with regression.
METHODS: Twelve patients ( 22 eyes ) with regression after LASIK were performed undersurface ablation of the flap. The mean of preoperative refractive error was -2. 27±0-88D, the astigmatism was -0. 44±0. 30D, the central corneal thickness was 424. 9±8. 2μm. The follow-up time was 1a, including visual acuity, refractive error, the elevation of posterior cornea, WavScan. The data was analyzed with Student's t test andχ2test.
RESULTS:During the operation, the measured stromal thickness was 275. 4±9. 3μm, the flap thickness 144. 7±7-5μm, the depth of ablation 28. 1±9. 3μm. The mean postoperative uncorrected visual acuity (UCVA) was 4. 99±0. 04, best corrected visual acuity ( BCVA) 5. 03±0. 04, at 1a follow up. There was no patient with postoperative BCVA decreasing, compared to preoperation. Mean spherical refraction decreased to-0. 22±0. 19 D at 1a follow up (t=10. 232, P<0. 001) and the astigmatism decreased to -0. 24±0. 26 D (t=2. 365, P=0. 028). The elevation of posterior cornea changed from 1. 95 ± 1. 68μm preoperatively to 2. 00±1. 88μm after 1a, but there was no statistical significance (t=0. 090, P= 0. 929). The coma changed from 0. 283±0. 112μm preoperatively to 0. 331±0-149μm after 1a (no statistical significance, t=1. 452, P=0. 161) and the spherical aberration changed from 0. 320±0. 119μm to 0. 341±0. 103μm (no statistical significance, t=0. 390, P=0. 674).
CONCLUSION:UAF, as one of a choice, is an effective and safe procedure for the treatment of regression after LASIK, based on the reasonable surgery design.
