准分子激光原位角膜磨镶术后不同时期角膜地形图的改变

Corneal topography changes at different stages after excimer laser in situ keratomileusis

目的 :探讨准分子激光原位角膜磨镶术后不同时期角膜地形图的形态变化与术后视功能状况之间的关系。方法 :采用激光辅助原位角膜磨镶术治疗近视 ,共 139例 2 5 5只眼 ,按屈光度不同分为低、中度组 (Ⅰ组 :- 1 2 5～ - 6 0 0D ,12 5只眼 )与高度组 (Ⅱ组 :- 6 2 5～ - 2 0 5 0D ,130只眼 ) ,手术前、术后 3、6个月行屈光及角膜地形图检查。结果 :术后 6个月与 3个月相比 ,两组的角膜地形图中模拟角膜曲率计 (SimK)读数有显著差异 ,而低、中度组屈光度变化不明显 ,高度组屈光度有明显变化。角膜地形图形状决定视功能情况。结论 :角膜地形图中模拟角膜曲率计 (SimK)读数及角膜地形图形态与术后效果之间有非常密切的关系。

Objective:To investigate the relations between the shape of corneal topography and visual acuity at different stages after excimer laser in situ keratomileusis.Methods:139 cases (255 eyes) of myopia were operated with excimer laser in situ keratomileusis.They were classified into 2 groups: low,middle group (Ⅰgroup:-1 25～-6 00D,125 eyes) and high group (Ⅱgroup:-6 25～-20 50D,130 eyes) according to the refractive diopters.The visual acuity and corneal topography were examined before operation and at the third and sixth month postoperative follow-up visits. Results:Compare the results at 6 month with those at 3 month, there are significant differences in the Simulated keratoscope (SimK) reading.The refractive diopters do not change evidently in Ⅰgroup but change in Ⅱgroup.The shape of the topography decides the visual acuity.Conclusion: The Simulated keratoscope (SimK) reading and the shape of corneal topography are closely related to postoperative results.