近视患者两种角膜地形图系统检测值的对比分析

Comparing of two types of corneal topography system’s outcome in myopes

目的探讨不同程度近视患者两种角膜地形图系统检测值差异。方法抽取2009-02-06在广西视光中心就诊的45例近视患者,其中男25例,女20例;年龄18～39岁,屈光度-0.50～-9.00DS(等效球镜);采用Bausch&Lomb公司生产的Orbscan-Ⅱz角膜地形图系统和Zeiss公司生产的Humphrey ALTAS角膜地形图系统对所有患者进行检测,收集每位患者的两种角膜地形图数据模拟K值(SimK’s)、角膜散光(Axis)、最大值(Max.)及最小值(Min.)。使用SPSS13.0统计软件采用配对t检验分别比较各检测值的差异。结果两种角膜地形图系统检测值SimK’s、Axis、Max.、Min.均不相同,P值分别为0.037、0.004、0.072、0.000。Humphrey ALTAS所得的陡峭K(Max.)和平坦K(Min.)及角膜散光轴向均大于Orbscan-Ⅱz的陡峭K(Max.)和平坦K(Min.)及角膜散光轴向(Axis),而前者所测得的角膜散光度数即SimK’s值则小于Orbscan-Ⅱz角膜地形图系统的SimK’s值。结论Humphrey ALTAS和Orbscan-Ⅱz两种角膜地形图系统的一致性较好。

Objective To investigate the differnces of two types of corneal topography system＇ s outcome in myopes. Methods Forty-five myoipc out-patients （ male 25, female 20） of Guangxi vision science and optometry center in Feb. 6, 2009, aged from nineteen to thirty-nine, and refractive power ranged from -0. 50 to -9. 00 diopters（spherical equivalent） were enrolled in this study. Orbscan-Ⅱz （Bause-Lomb corp. made in USA） and Humphrey ALTAS （Zeiss corp. made in Germany） corneal topography system were used to capture each myopic corneal images, respectively. And anterior corneal surface indexes such as Sim K＇ s, Axis, Max. , Min. values were obtained in this study. Paired t-test were used to compare the differences of two corneal topography systems by SPSS 13.0 ver- sion software. Results Outcomes demonstrated that Sim K＇ s, corneal astigmatism axis, Max. , and Min. values were all different in this study. Paired t-test showed that P values were 0. 037,0. 004,0. 072,0. 000, respectively. Max. , Min. values and corneal astigmatism axis in Humphrey ALTAS were greater than those in Orbscan-Ⅱ z corneal topography system. But Sim K＇ s values in Humphrey ALTAS were less than that in Orbscan- Ⅱz corneal topography sys- tem. Conclusion Fine agreements were found in Sim K＇ s, Axis, Max, and Min values between Orbscan-Ⅱ z and Humphrey ALTAS corneal topography system.