Department of Ophthalmology, Ondokuz Mayis University Faculty of Medicine, Samsun, Turkey.
Department of Ophthalmology, Merzifon Kara Mustafa Pasa State Hospital, Amasya, Turkey.
Indian J Ophthalmol. 2019 Apr;67(4):496-499. doi: 10.4103/ijo.IJO_960_18.
To compare central corneal thickness (CCT) measurements obtained by the AL-Scan, Lenstar LS900, Galilei, and ultrasound pachymetry (UP) in normal and cataractous eyes.
Eighty eyes of healthy subjects were included in the study. Each subject was assessed by four different methods of measurements using the AL-Scan, Lenstar LS900, Galilei, and UP by a single examiner. To assess the intraobserver repeatability, three consecutive measurements were taken for the AL-Scan.
The mean CCT [± standard deviation (SD)] for the AL-Scan, Lenstar LS900, Galilei, and UP were 554.6 ± 30.9 μm, 542.9 ± 31.3 μm, 570.7 ± 30 μm, and 552.7 ± 32.8 μm, respectively. The differences between pairs of mean CCT for the methods are statistically significant for the pairs of Galilei-UP, AL-Scan-Galilei, and Lenstar LS900-Galilei. Bland-Altman plots showed that AL-Scan-UP have the closest agreement, followed by Lenstar-UP and AL-Scan-Lenstar. Galilei was found to have the poorest agreement with the other three methods. The intraobserver repeatability of the AL-Scan was very good with an intraclass correlation coefficient (ICC) of 0.980.
We found that CCT measurements between the AL-Scan-UP, Lenstar LS900-UP, and AL-Scan-Lenstar LS900 showed very strong correlation and comparable agreement. AL-Scan-UP showed the closest agreement and these devices can be used interchangeably in clinical practice. Galilei significantly showed higher value of CCT compared to other methods. It was also observed that the Al-Scan had excellent intraobserver repeatability.
比较 AL-Scan、Lenstar LS900、Galilei 和超声角膜测厚仪（UP）在正常眼和白内障眼中测量的中央角膜厚度（CCT）。
本研究纳入 80 只健康眼。每位受试者均由一位检查者使用 AL-Scan、Lenstar LS900、Galilei 和 UP 四种不同的方法进行评估。为评估观察者内重复性，对 AL-Scan 进行了三次连续测量。
AL-Scan、Lenstar LS900、Galilei 和 UP 的平均 CCT（±标准差）分别为 554.6±30.9μm、542.9±31.3μm、570.7±30μm 和 552.7±32.8μm。方法间 CCT 均值的差异在 Galilei-UP、AL-Scan-Galilei 和 Lenstar LS900-Galilei 对之间具有统计学意义。Bland-Altman 图显示 AL-Scan-UP 具有最接近的一致性，其次是 Lenstar-UP 和 AL-Scan-Lenstar。Galilei 与其他三种方法的一致性最差。AL-Scan 的观察者内重复性非常好，组内相关系数（ICC）为 0.980。
我们发现 AL-Scan-UP、Lenstar LS900-UP 和 AL-Scan-Lenstar LS900 之间的 CCT 测量值相关性很强，一致性相当。AL-Scan-UP 显示出最接近的一致性，这两种设备在临床实践中可以互换使用。与其他方法相比，Galilei 显著显示出 CCT 值更高。还观察到 Al-Scan 具有出色的观察者内重复性。
