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首页> 外文期刊>Journal of Optometry >Agreement between total corneal astigmatism calculated by vector summation and total corneal astigmatism measured by ray tracing using Galilei double Scheimpflug analyzer
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Agreement between total corneal astigmatism calculated by vector summation and total corneal astigmatism measured by ray tracing using Galilei double Scheimpflug analyzer

机译：使用矢量加总法计算的总角膜散光与使用Galilei double Scheimpflug分析仪通过射线追踪测量的总角膜散光之间的一致性

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Purpose To evaluate the agreement between total corneal astigmatism calculated by vector summation of anterior and posterior corneal astigmatism (TCAVec) and total corneal astigmatism measured by ray tracing (TCARay). Methods This study enrolled a total of 204 right eyes of 204 normal subjects. The eyes were measured using a Galilei double Scheimpflug analyzer. The measured parameters included simulated keratometric astigmatism using the keratometric index, anterior corneal astigmatism using the corneal refractive index, posterior corneal astigmatism, and TCARay. TCAVec was derived by vector summation of the astigmatism on the anterior and posterior corneal surfaces. The magnitudes and axes of TCAVec and TCARay were compared. The Pearson correlation coefficient and Bland–Altman plots were used to assess the relationship and agreement between TCAVec and TCARay, respectively. Results The mean TCAVec and TCARay magnitudes were 0.76?±?0.57?D and 1.00?±?0.78?D, respectively ( P Vec and TCARay magnitudes ( r =?0.96, P Vec and TCARay axes ( r =?0.75, P Vec and TCARay magnitudes from ?0.33 to 0.82?D. The 95% limits of agreement between the TCAVec and TCARay axes was ?43.0 to 52.1°. Conclusion The magnitudes and axes of astigmatisms measured by the vector summation and ray tracing methods cannot be used interchangeably. There was a systematic error between the TCAVec and TCARay magnitudes.
机译：目的评估通过前后角膜散光矢量和（TCA Vec ）计算的总角膜散光与通过射线追踪（TCA Ray ）测量的总角膜散光之间的一致性。方法本研究共纳入了204名正常人的204只右眼。使用Galilei双Scheimpflug分析仪测量眼睛。测量的参数包括使用角膜曲率指数的模拟角膜散光，使用角膜折光指数的前角膜散光，后角膜散光和TCA Ray 。 TCA Vec 是通过对角膜前表面和后表面的散光进行矢量求和而得出的。比较了TCA Vec 和TCA Ray 的大小和轴。利用皮尔逊相关系数和布兰德-奥特曼图分别评估了TCA Vec 和TCA Ray 之间的关系和一致性。结果平均TCA Vec 和TCA Ray 幅度分别为0.76？±？0.57？D和1.00？±？0.78？D（P Vec 和TCA Ray 幅值（r =？0.96，P Vec 和TCA Ray 轴（r =？0.75，P Vec 和TCA Ray 幅值从？0.33到0.82？D。TCA Vec 和TCA Ray 轴之间的95％一致极限为？43.0至52.1°。向量求和和射线追踪方法测得的像散大小和轴不能互换使用，TCA 和TCA Ray 大小之间存在系统误差。

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