不同仪器测量角膜曲率的准确性研究

The accuracy of corneal curvature measured by different types of keratometry

目的研究比较手动角膜曲率计、电脑自动验光仪、角膜地形图和光学相干生物测量仪(IOL-Master)四种仪器测量角膜曲率的测量结果准确性。方法应用四种仪器分别测量拟施行白内障超声乳化摘除及人工晶体植入术的患者86例(124眼)的平均、最大及最小角膜屈光力、角膜散光度数及散光轴位,用SPSS15.0软件对测量参数进行统计学分析。结果这四种仪器测得的平均、最大及最小角膜屈光力、角膜散光度数无显著差异(P>0.05),角膜散光轴位测量结果有显著差异(P<0.01)。结论四种仪器测量角膜曲率的准确性较好。

Objective We compared and evaluated the accuracy of the four types of keratometry： manual keratometer, auto-refractometer, corneal topography and IOL-Master for measurement the corneal curvature. Methods Preoperative measurement of corneal curvature was prospectively obtained in 124 eyes of 86 subjects that underwent phacoemusification with intraocular lens implantation with four types of keratometry. Corneal refractive powers in mean values, corneal refractive powers in maximum axis, corneal refractive powers in minimum axis and the degree of axis were analysized by using SPSS 15.0 in one way ANOVA for statistics. Results There was no significant difference in measuring of the mean corneal refractive powers by using four different types of keratometry （P〉0.05）. There were also no significant differences in measuring degrees of the corneal refractive powers in maximum axis, corneal refractive powers in minimum axis and corneal astigmatism degree（P 〉 0.05）. But there was significant difference in measuring of the axis values of corneal astigmatism （P 〈 0.01）. Conclusion The accuracy of corneal curvature measured by different types of keratometry is perfect.