不同近视程度及准分子激光屈光术后角膜地形图分析

Corneal topographic analysis after axcimer laser keratorefractive surgery for correction of different degree of myopia

目的分析不同近视程度患者的角膜地形图及准分子激光术前、术后角膜地形图的差异，了解不同近视程度及术后角膜表面形态的改变。方法回顾性分析2004年在我院行准分子激光屈光性手术的159例患者的角膜地形图资料，比较SRI、SAI、CLY等反映角膜表面形态的参数，采用SPSS13．0统计软件进行统计分析。结果不同近视程度组间角膜地形图比较示：CYL的差异有统计学意义（P〈0．05），而SRI、SAI各组问没有明显差异P〉0．05）；准分子激光屈光性手术前后角膜地形图参数分析示：术后CYL、SRI、SAI均有显著变化（P〈0．01），其差异具有统计学意义。结论不同程度的近视患者间角膜表面的规则程度、对称性没有显著差异，而散光程度随近视度数增大而有所增加。准分子激光术后角膜规则性、对称性、散光程度均有显著改变，行准分子激光术矫正屈光不正时应更加注重角膜形态的改变，以减少术后视觉质量及光学问题的发生。

Objective To analyze the change on corneal topography before and after excimer laser keratorefraetive surgery for correction of different degree of myopia, and to investigate the corneal shape changes after excimer laser keratorefractive surgery for correction of myopia. Methods 159 patients received excimer laser keratorefractive surgery in our hospital were included in the retrospective study. Parameters refreeting corneal surface, such as SRI,SAI,CLY, were analyzed in SPSS 13.0 statistics soft-ware. Results As is indicated on the Corneal Topography of Myopia of different degree： There was significant difference in CYL （P 〈0.05 ）,and no significant difference in SRI,SAI of each group（P 〉0.05 ）; As is indicated on the corneal topography before and after excimer laser keratorefractive surgery： CYL, SRI, SAI changed with statistical significance after operation （P 〈0.01 ）. Conclusion Among the patients of different degree of myopia, there was no significant difference in surface regularity and symmetry, and corneal astigmatism increased with an increase in the degree of refractive error .But there was significant difference in surface regularity ,symmetry and corneal astigmatism after exeimer laser keratorefractive surgery. Therefore, when excimer laser keratorefractive surgery for correction of myopia is performing, more attention should be paid to the change of corneal surface, which helps reduce the occurrence of visual quality and optical questions.