超声角膜测厚仪和角膜地形图测量LASIK前后的角膜厚度

A comparison of ultrasonic corneal thickness measurement and corneal topography in the measurement of central corneal thickness before and after LASIK

目的 :比较不同方法测量LASIK术前后角膜厚度的差异。方法 :分别用JEMED/EGH 40 0 0型超声角膜测厚仪和Orbscan Ⅱ眼前节系统于LASIK术前及术后一月测量角膜中心厚度各三次 ,取其均值比较。结果 :LASIK术前两种方法测量结果差异无显著性意义 (P >0 .0 5 )。术后Orbscan Ⅱ眼前节分析诊断系统测量中心角膜厚度值低于超声角膜测厚仪 ,两者比较差异有显著性意义 (P <0 .0 5 )。结论 :LASIK术后 ,角膜弯曲度、球面性的改变及其设计理论 ,可能影响角膜地形图的测定结果。对于欠矫病例再手术时 ,应用两种方法测量角膜厚度 ,互相参照 ,为再次手术提供保障。

Objective:To compare corneal thickenss value before and after LASIK operation with two different measurement.Methods:JEMED/EGH 4000 ultrosonic corneal thickness measurement and Orbscan Ⅱ anterior system were used to measure the central corneal thickness one month before and after LASIK.Results:There was no significant difference between the two methods before LASIK(P>0.05),but they had significant difference(P<0.05) after LASIK, with Orbscan Ⅱ anterior system show lower values than those of ultrasonic meaurement in central corneal thickness. Conclusion:After LASIK, corneal topography may be affected by corneal sphere,curvature change and the design. A comparative analysis of the two values can offer reference for the undercorrected cases when they were designed to be re operated.