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Comparison of horizontal corneal diameter measurements using the orbscan IIz and pentacam HR systems

机译：使用Orbscan IIz和pentacam HR系统进行水平角膜直径测量的比较

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Purpose: To compare 2 automated devices for measuring the horizontal corneal diameter [white-to-white (WTW) distance]. Methods: In this prospective comparative case series, the WTW distance was measured by independent examiners using the Pentacam HR and the Orbscan IIz in 101 eyes of 101 healthy refractive surgery candidates. Statistical evaluation was performed using the paired t test, Pearson correlation, and the Bland-Altman method for comparison of measurement techniques. Results: The mean WTW distance measurements were 11.76 ± 0.38 mm as obtained with the Pentacam HR and 11.66 ± 0.37 mm as obtained with the Orbscan IIz (P < 0.001). The measurements were highly correlated (Pearson correlation coefficient = 0.948; P < 0.001). The 95% limits of agreement for the Pentacam HR versus the Orbscan IIz were-0.14 to 0.33 mm. Conclusions: The observed differences in WTW distance readings between the Pentacam HR and the Orbscan IIz are not clinically relevant, and the 2 devices could be used interchangeably in clinical practice.
机译：目的：比较两个用于测量水平角膜直径[白到白（WTW）距离]的自动化设备。方法：在此前瞻性比较病例系列中，由独立检查人员使用Pentacam HR和Orbscan IIz在101名健康屈光手术候选人的101只眼中测量WTW距离。使用配对t检验，Pearson相关性和Bland-Altman方法进行统计评估，以比较测量技术。结果：Pentacam HR获得的平均WTW距离测量值为11.76±0.38 mm，而Orbscan IIz获得的平均WTW距离测量值为11.66±0.37 mm（P <0.001）。测量值高度相关（Pearson相关系数= 0.948; P <0.001）。 Pentacam HR与Orbscan IIz的95％一致性限制为-0.14至0.33 mm。结论：Pentacam HR和Orbscan IIz在WTW距离读数上观察到的差异在临床上不相关，并且这两种设备可在临床实践中互换使用。

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