Ophthalmology Departament, Railway Hospital, Katowice, Poland.
School of Medicine, Division of Dentistry, Zabrze Medical University of Silesia, Katowice, Poland.
PLoS One. 2020 Apr 2;15(4):e0230589. doi: 10.1371/journal.pone.0230589. eCollection 2020.
To test the repeatability and reproducibility of the topography module in posterior segment spectral domain optical coherence tomography with Revo NX (new device) and to compare keratometry values obtained by a Scheimpflug tomography (Galilei G6) and a swept source OCT (Casia 2).
In this prospective study, healthy subjects with nonoperated eyes had their central corneal thickness (CCT), anterior and posterior K1/K2 corneal power measured with the new device. Two operators made 6 measurements on the new device to check intraobserver repeatability and reproducibility, and measurement on Casia 2 and Galilei G6. Bland-Altman plots were used to assess the agreement between the devices for each analyzed variable.
94 eyes (94 patients) were studied. All devices produced significantly different mean CCT, the highest for Galilei 569.13±37.58 μm followed by Casia 545.00 ±36.15 μm and Revo 537.39±35.92 μm. The mean anterior K1 was 43.21 ± 1.37 for Casia 2 43.21 ± 1.55 for Revo NX and 43.19 ± 1.39 for Galilei G6, and the differences were insignificant p = 0.617. The posterior K1 for Revo NX was -5.77 ± 0.25 whereas for Casia 2 it was -5.98±0.22 and for Galilei G6-6.09±0.28 D p< 0.0001. The Revo NX showed intraclass correlation coefficient ranging from 0.975 for the posterior K2 surface, and 0.994 for anterior K1 and 0.998 for CCT.
Revo NX is independent of the user and offers a high level of repeatability for the anterior and posterior cornea. The wide range of differences between the devices suggests they should not be used interchangeably.
测试使用 Revo NX（新型设备）的后节光谱域光学相干断层扫描的地形模块的可重复性和再现性，并比较Scheimpflug 断层扫描（Galilei G6）和扫频源 OCT（Casia 2）获得的角膜曲率值。
在这项前瞻性研究中，对未接受手术的健康受试者的中央角膜厚度（CCT）、前角膜 K1/K2 角膜力和后角膜 K1/K2 角膜力进行测量。两名操作员在新型设备上进行 6 次测量，以检查观察者内的可重复性和再现性，以及 Casia 2 和 Galilei G6 的测量值。 Bland-Altman 图用于评估设备之间每个分析变量的一致性。
94 只眼（94 例患者）纳入研究。所有设备产生的 CCT 平均值均显著不同，Galilei 为 569.13±37.58 μm，Casia 2 为 545.00±36.15 μm，Revo 为 537.39±35.92 μm。Casia 2 的平均前 K1 为 43.21 ± 1.37，Revo NX 为 43.21 ± 1.55，Galilei G6 为 43.19 ± 1.39，差异无统计学意义（p = 0.617）。Revo NX 的后 K1 为-5.77 ± 0.25，而 Casia 2 的后 K1 为-5.98±0.22，Galilei G6 的后 K1 为-6.09±0.28 D，p<0.0001。Revo NX 的内部一致性系数范围为后 K2 表面 0.975，前 K1 为 0.994，CCT 为 0.998。
Revo NX 不受用户影响，对前、后角膜具有较高的可重复性。各设备之间差异较大，表明不应互换使用。
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