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Correlation of the corneal toricity between anterior and posterior corneal surfaces in the normal human eye

机译：正常人眼角膜前后表面角膜复曲面的相关性

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Purpose: To evaluate the correlation of the magnitude of corneal toricity and power vector components of both corneal surfaces measured with a Scheimpflug photography-based system. Methods: A total of 117 healthy normal eyes of 117 subjects selected randomly with ages ranging from 7 to 80 years were included. All eyes received an anterior segment and corneal analysis with the Sirius system (CSO) evaluating the anterior and posterior mean toricity for 3 and 7 mm (aAST and pAST). The vector components J0 and J45 as well as the overall strength blur (B) were calculated for each keratometric measurement using the procedure defined by Thibos and Horner. Results: The coefficient of correlation between aAST and pAST was 0.52 and 0.62 and the mean anteroposterior ratio for toricity was 0.46 ± 0.39 and 0.57 ± 0.75 for 3 and 7 mm, respectively. These ratios correlated significantly with aAST, anterior corneal J0, and manifest refraction J0 (r ≥ 0.39, P 0.01). The coefficient of correlation was 0.69 and 0.81 between anterior and posterior J0 for 3 and 7 mm, respectively. For J 45, the coefficients were 0.62 and 0.71, respectively. The linear regression analysis revealed that the pAST and power vectors could be predicted from the anterior corneal data (R2 ≥ 0.40, P 0.01). Conclusions: The toricity and astigmatic power vector components of the posterior corneal surface in the human healthy eye are related to those of the anterior and therefore can be predicted consistently from the anterior toricity and astigmatic power vectors.
机译：目的：评估使用基于Scheimpflug摄影的系统测量的两个角膜表面的角膜复曲面强度和功率矢量分量之间的相关性。方法：随机选择117名年龄在7至80岁之间的受试者的117只健康正常眼。所有患者的眼睛均接受前段和角膜分析，并使用Sirius系统（CSO）评估3毫米和7毫米（aAST和pAST）的前后平均复曲面。使用Thibos和Horner定义的程序，针对每个角膜测量法计算矢量分量J0和J45以及总体强度模糊（B）。结果：aAST和pAST之间的相关系数分别为0.52和0.62，曲率的平均前后位比分别为3和7 mm，分别为0.46±0.39和0.57±0.75。这些比率与aAST，角膜前J0和明显屈光J0显着相关（r≥0.39，P <0.01）。前后J0在3 mm和7 mm处的相关系数分别为0.69和0.81。对于J 45，系数分别为0.62和0.71。线性回归分析表明，pAST和功率向量可以从角膜前数据预测（R2≥0.40，P <0.01）。结论：在人类健康的眼睛中，角膜后表面的复曲面和散光屈光度矢量分量与前者有关，因此可以从前复曲面和散光屈光度矢量一致地进行预测。

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