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BioMed Research International
Volume 2014 (2014), Article ID 808646, 6 pages
Research Article

Repeatability of Ocular Measurements with a Dual-Scheimpflug Analyzer in Healthy Eyes

1Department of Applied Physics, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
2Aragon Health Sciences Institute, Avenida San Juan Bosco, 13, 50009 Zaragoza, Spain
3Department of Surgery, Gynecology and Obstetrics, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
4Department of Physiology and Pharmacology, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
5Department of Ophthalmology, Lozano Blesa University Hospital, Avenida San Juan Bosco, 15, 50009 Zaragoza, Spain

Received 4 February 2014; Accepted 28 March 2014; Published 24 April 2014

Academic Editor: Achim Langenbucher

Copyright © 2014 Carmen Lopez de la Fuente et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. To assess the repeatability of the Galilei dual Scheimpflug analyzer (GDSA) in anterior segment examination. Methods. Fifty-two eyes from 52 healthy volunteers were prospectively and consecutively recruited. Anatomic, axial, refractive, and instantaneous parameters were measured with GDSA to provide a complete characterization of the anterior segment. Repeatability was assessed calculating intraclass correlation coefficient (ICC), and coefficient of variation (COV). Results. Correlation among repeated measurements showed almost perfect reliability (ICC > 0.81) for all parameters except thinnest central corneal thickness (CCT) (0.78), corneal thickness average out (0.79), and posterior axial curvature average out (0.60). Repeatability was excellent (COV 10%) for all parameters except anterior chamber volume and, superior iridocorneal angle and eccentricities. In these last three parameters, repeatability limits were excessively high compared to the mean. Conclusions. GDSA in healthy young persons had an almost perfect correlation in measuring anatomic, axial, instantaneous, and refractive parameters with greater variability for peripheral terms. Repeatability of anatomical parameters like pachymetry, anterior chamber, or iridocorneal angle and eccentricity were limited. In healthy young persons, the other evaluated parameters had very good repeatability and their limits of agreement showed excellent clinical results for this device.