Scheimpflug-Placido topographer and optical low-coherence reflectometry biometer: Rep

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Scheimpflug-Placido topographer and optical low-coherence reflectometry biometer: Repeatability and agreement. J Cataract Refract Surg. 2012 Jul 3; Authors: Chen W, McAlinden C, Pesudovs K, Wang Q, Lu F, Feng Y, Chen J, Huang J Abstract 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 Ã

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