准分子激光原位角膜磨镶术后角膜后表面形态变化

目的观察近视眼准分子激光原位角膜磨镶术(laser in situ keratomileusis,LASIK)后角膜后表面形态变化。方法将151例(288眼)近视患者按近视程度分为低度近视组、中度近视组和高度近视组,采用眼前节全景仪分别于术前,术后1、3、6个月检测各组角膜后表面屈光力和角膜后表面高度,并进行动态对比分析。结果低、中度近视组术后各时间段的角膜后表面屈光力及后表面高度与术前比较无明显改变(P>0.05);而在高度近视组,术后1、3个月角膜后表面屈光力比术前均有增加(P<0.05),术后6个月角膜后表面屈光力与术前比较无明显变化;术后各时间段角膜后表面高度均较术前增加(P<0.05)。结论 LASIK手术可改变高度近视患者的角膜后表面屈光力及后表面高度,眼前节全景仪对于高度近视LASIK术后疗效观察评估具有重要意义。

Dynamic changes of corneal posterior surface after myopic excimer laser in situ keratomileusis

Objective To observe the changes of corneal posterior surface of myopia after laser in situ keratomileusis(LASIK).Methods Before and after surgery pentacam imaging system was used to measure the curve and elevation of corneal posterior surface of 151 cases(288 eyes).Measured eyes were divided into low myopia(105 eyes),moderate myopia(95 eyes) and high myopia(88 eyes) according to the mean spherical equivalent.The results of measurement in different time-points were compared each other among three groups.Results There were no significant difference in the curvature and elevation of corneal posterior surface before and after surgery among the low myopia and moderate myopia groups in different time-points(P>0.05).The curvature of corneal posterior surface in high myopia between the first and third month postoperation were higher than preoperation(P<0.05),but there were no difference changes at 6 months after surgery and before surgery.The elevation of corneal posterior surface in high myopia were higher in difference time-point after surgery than before surgery(P<0.05).Conclusion The curvature and elevation corneal posterior surface in high myopia will be changed at post-LASIK.The application of pentacam imaging system has an important clinical significance in assessment of the efficacy of post-LASIK.