超声角膜测厚仪和角膜地形图测量LASIK前后的角膜厚度

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/EGH4000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＞0.05)。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＜0.05)。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。对于欠矫症例再手术时，应用两种方法测量角膜厚度，互相参想，为再次手术提供保障。

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

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.