Intrasession repeatability of ocular anatomical measurements obtained with a multidiagnostic device in healthy eyes

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Title: Intrasession repeatability of ocular anatomical measurements obtained with a multidiagnostic device in healthy eyes
Authors: Piñero, David P. | Cabezos, Inmaculada | López Navarro, Alberto | Fez Saiz, Dolores de | Caballero, María T. | Camps, Vicente J.
Research Group/s: Grupo de Óptica y Percepción Visual (GOPV)
Center, Department or Service: Universidad de Alicante. Departamento de Óptica, Farmacología y Anatomía
Keywords: Anterior chamber depth | Pachymetry | White-to-white | Irido-corneal angle | Scheimpflug imaging | VX120 system
Knowledge Area: Óptica
Issue Date: 18-Oct-2017
Publisher: BioMed Central
Citation: BMC Ophthalmology. 2017, 17:193. doi:10.1186/s12886-017-0589-x
Abstract: Background: To evaluate the intrasession repeatability of anterior chamber depth (ACD), central (CCT) and peripheral corneal thickness (PCT), white-to-white diameter (WTW), and irido-corneal angle (IA) measurements obtained with a multidiagnostic device in healthy eyes. Methods: A total of 107 eyes of 107 patients ranging in age from 23 to 65 years were examined with the VX120 system (Visionix-Luneau Technologies). Three consecutive measurements were obtained with this device to assess the intrasession repeatability of ACD, CCT, PCT at different nasal and temporal locations, WTW, and nasal and temporal IA. Data analysis included the calculation of within-subject standard deviation (Sw), intrasubject precision (1.96xSw), coefficient of variation (CV) and intraclass correlation coefficient (ICC). Results: The Sw and CV for ACD was 0.03 mm and 1.16%, respectively, with an ICC of 0.992. The Sw values for central and peripheral pachymetric measurements were below 9 μm, with CV of less than 1.6% and ICC of 0.976 or higher. For IA measurements, Sw values of 0.84 or lower were found, with a CV between 1 and 2%, and an ICC of more than 0.970. The Sw for WTW was 0.24 mm and the CV was 1.95%. No statistically significant correlations were found between any anatomical parameter evaluated and their Sw and CV values associated (−0.220 ≤ r ≤ 0.204, p ≥ 0.125). Conclusions: The VX120 system is able to provide repeatable measurements of anatomical parameters in healthy eyes. Inter-observer repeatability should be evaluated in future studies.
ISSN: 1471-2415
DOI: 10.1186/s12886-017-0589-x
Language: eng
Type: info:eu-repo/semantics/article
Rights: © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.
Peer Review: si
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