Pentacam三维眼前节分析诊断系统与Keratron Scout角膜像差仪测量Kappa角的比较

Comparison of the Angle Kappa Measured by Pentacam and Keratron Scout

目的:比较Pentacam三维眼前节分析诊断系统与Keratron Scout角膜像差仪测量屈光手术患者Kappa角大小的差异。方法:系列病例研究。选取空军军医大学西京医院眼科屈光矫正中心术前筛查患者98例(196眼)。在同一环境下进行Pentacam与Keratron Scout检查,记录2种检查方式的瞳孔直径、Kappa角大小(采用直角坐标系表示),从而获得Kappa角在角膜的x轴和y轴偏移量,比较2种检查方法测量的Kappa角大小的差异及2种检查方法的相关性。采用配对t检验以及Pearson相关分析进行数据处理。结果:Pentacam与Keratron Scout测量近视患者的瞳孔直径分别为右眼(3.17±0.44)mm、(3.19±0.53)mm,左眼(3.25±0.65)mm、(3.33±0.48)mm,二者差异均无统计学意义。Pentacam与Keratron Scout测得双眼的Kappa角x轴以及y轴偏移量的差异均无统计学意义,2种方法测得的Kappa角偏移量具有显著相关性(P<0.05),右眼x轴相关系数为0.966,y轴为0.969,左眼x轴为0.956,y轴为0.913。结论:在瞳孔直径一致的条件下,Pentacam三维眼前节分析诊断系统与Keratron Scout角膜像差仪测量近视以及近视散光患者Kappa角无差异,在手术设计中均可作为Kappa角调整的参考。

Objective:To investigate and analyze the difference in angle Kappa measured by Pentacam and Keratron Scout in refractive surgery patients.Methods:One hundred ninety-six eyes of 98 patients screened for refractive surgery were enrolled in this case series study.Pupil diameters and angle Kappa expressed in rectangular coordinates were measured by Pentacam and Keratron Scout.Data differences and correlation between the two examinations were compared and analyzed by a paired t test and Pearson correlation analysis.Results:Pupil diameters measured by Pentacam and Keratron Scout were 3.17±0.44 mm,3.19±0.53 mm(right eye),and 3.25±0.65 mm,3.33±0.48 mm(left eye),respectively.The differences between the two instruments were not significant.The horizontal and vertical offset measured by the two instruments were not statistically different.There was a significant correlation in the offset of the angle Kappa measured by the two instruments(P<0.05).The correlation coefficients of the right eye horizontal offset,right eye vertical offset,left eye horizontal offset,left eye vertical offset were 0.966,0.969,0.956 and 0.913,respectively.Conclusion:There is no statistically significant difference between angle Kappa measured by Pentacam and Keratron Scout when pupil diameters are consistent.Both instruments can be used as a reference for the adjustment in angle Kappa in refractive surgery.