Pentacam和Keratron Scout测量Kappa角的一致性分析

Consistency analysis of Kappa angle measurement by Pentacam and Keratron Scout

目的:探讨Pentacam眼前节分析仪和Keratron Scout角膜地形图仪测量Kappa角的一致性,评价两种仪器测量结果的重复性。方法:前瞻性随机对照研究。选取2018-01-01/30在我院眼视光中心行近视术前检查的患者69例,所有受试者由同一检查者分别采用Pentacam和Keratron Scout重复测量3次,以(X ,Y)坐标形式记录Kappa角的大小,采用组内相关系数(ICC)、Cronbach s Alpha系数评价两种仪器测量Kappa角的重复性;t 检验比较两种仪器测量结果的差异,Pearson相关分析其相关性;Bland-Altman图评估两种仪器测量结果的一致性。结果:3次重复测量时,两种仪器均表现出很好的重复性,两种仪器测得Kappa角差异无统计学意义( X 值: P =0.17;Y 值: P =0.61),Pearson相关分析表明Kappa角大小具有相关性(X 值: r =0.90, P <0.01;Y 值: r =0.91, P <0.01)。Bland-Altman图显示 X 值和 Y 值95%一致性区间分别为-0.11~0.14mm和-0.10~0.11mm。结论:Pentacam眼前节分析仪和Keratron Scout角膜地形图仪测量角膜屈光手术患者Kappa角重复性好,两种仪器测量的Kappa角结果一致性好,可以相互验证。

AIM: To investigate the repeatability and agreement of Pentacam Front Section Analyzer and Keratron Scout Corneal Topographer in measuring Kappa angle. METHODS: Totally 69 patients were randomly selected from Ophthalmology Department of Leshan People’s Hospital. Three readings were taken by the same examiner. Results were recorded in ( X , Y ) coordinates format and assessed by intraclass correlation coefficient (ICC),Cronbach s Alpha Coefficient, t- test,Pearson correlation analysis and bland-altman analysis. RESULTS: Both instruments showed excellent repeatability in Kappa angle assessment. The results significantly correlated ( X value: r =0.90, P <0.01;Y value: r = 0.91, P <0.01), however,no significant difference were found between the two instruments. The widest 95% LoA was -0.11-0.14mm for X coordinate and -0.10-0.11mm for Y . CONCLUSION: Pentacam and Keratron Scout showed excellent repeatability and agreement in Kappa angle assessment. The two instruments could aid and verify each other.