- 作者：Wuhe Chen ; Colm McAlinden ; Konrad Pesudovs ; Qinmei Wang ; Fan Lu ; Yifan Feng ; Jie Chen ; Jinhai Huang
- 刊名：Journal of Cataract and Refractive Surgery
- 出版年：2012
- 出版时间：September, 2012
- 年：2012
- 卷：38
- 期：9
- 页码：1626-1632
- 全文大小：489 K
Purpose
To assess the repeatability of common measurements with the Sirius Scheimpflug-Placido topographer and Lenstar LS900 optical low-coherence reflectometry (OLCR) biometer and the limits of agreement (LoA) between the devices.Setting
Eye Hospital of Wenzhou Medical College, Wenzhou, China.
Design
Comparative evaluation of a diagnostic test or technology.
Methods
One randomly healthy eye of subjects was scanned 3 times with both devices. The parameters assessed were central corneal thickness (CCT), anterior chamber depth (ACD) from the corneal epithelium and from the endothelium, mean keratometry (K), and white-to-white (WTW) corneal diameter. The repeatability of scans was calculated using the within-subject standard deviation after 1-way analysis of variance was performed. The agreement between devices was assessed using the Bland-Altman LoA method, which equals the mean difference between devices ¡À 1.96 ¡Á standard deviation of the differences. The mean of 3 scans of each device was used to assess the LoA.
Results
Forty subjects were evaluated. The repeatability of the Scheimpflug-Placido topographer and OLCR biometer was 3.10 ¦Ìm and 3.32 ¦Ìm for CCT, 0.04 mm and 0.05 mm for WTW corneal diameter, and 0.17 D and 0.10 D for mean K, respectively. The repeatability for both devices was 0.02 mm for the ACD from the corneal epithelium and the ACD from the corneal endothelium. On Bland-Altman LoA analysis, all parameters were within clinically acceptable limits.
Conclusion
Both devices had excellent repeatability for all parameters assessed. Good LoAs were found between the 2 devices, indicating they can be used interchangeably for the parameters assessed.
Financial Disclosure
No author has a financial or proprietary interest in any material or method mentioned.