A one-year follow-up study of posterior corneal elevation after FS-LASIK
10.3969/j.issn.1006-5725.2014.06.032
- VernacularTitle:飞秒准分子激光原位角膜磨镶术后1年角膜后表面高度变化
- Author:
Yuanbiao LI
;
Liuning ZHAO
;
Fei LIU
;
Xiaobo XIAO
;
Qiang ZHOU
;
Aiping LIAO
;
Guoying LIU
;
Hong LIU
- Publication Type:Journal Article
- Keywords:
Posterior corneal elevation;
Thickness at central corneal thinnest point;
Femtosecond laser;
Laser in situ keratomileusis
- From:
The Journal of Practical Medicine
2014;(6):934-937
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the changes of posterior corneal elevation with one-year follow-up by using Allegro Oculyzer anterior segment diagnostic system in patients who had undergone laser in situ keratomileusis with femtosecond laser (FS-LASIK) for myopia. Methods Ninety eyes of forty-five patients who had undergone FS-LASIK for myopia were included in our study . The spherical equivalent of ametropia was-10.63D to -1.63D. The preoperative and postoperative corneal tomography (including 1, 3, 6 and 12 month after operation ) were collected by Allegro Oculyzer in the posterior corneal elevation and the thickness at central corneal thinnest point of each eye were measured , and the differences of the posterior corneal elevation were calculated. The data were analyzed with ANOVA and Pearson correlation analysis. Results There were no statistically significant differences in the changes of posterior corneal elevation from the preoperative time to the any postoperative follow-up time (F = 1.50, P > 0.05). There were no statistically significant changes of the posterior corneal elevation from the 1st month to 12th month postoperatively (F = 1.47, P > 0.05). There were statistically significant differences in the changes of thickness at central corneal thinnest point from the preoperative to the 12th month postoperative (F = 369.10, P <0.01). At postoperative time, the posterior corneal elevation was not correlated with several factors including spherical equivalent , ablation depth , residual bed thickness, ablation percentage per total corneal thickness and (corneal flap thickness + ablation depth) /thinnest point preoperative corneal thickness (P > 0.05). Conclusion After strictly followed surgical indications in FS-LASIK, the posterior corneal elevation can keep good stability and has no significant change. Thickness of central cornea thinnest point increases gradually and tends to stablity at the 3th months after surgery.
