Galilei Dual Scheimpflug Analyzer: Corneal thickness and anterior chamber characteristics in healthy human eyes

Abstract

Purpose To evaluate the repeatability of Corneal Thickness (CT) measurements and the normal values of Anterior Chamber Volume (ACV), iridocorneal angles and Anterior Chamber Depth (ACD) in healthy human eyes. Methods Pachymetry and Anterior Chamber (AC) parameters were recorded prospectively in a consecutive case series of 52 normal eyes. All the studied subjects had no ocular abnormalities rather than mild refractive error less than D EE. Measurements were performed using the Galilei Dual Scheimpflug Analyzer. Results There was a high intra‐observer agreement, finding the best value in the thinnest central CT with an intra‐class correlation coefficient (ICC) of 0.999 and the worst, in the peripheral CT, with an ICC of 0.807. ICC of 0.997 and 0.994 were found in central and paracentral CT respectively. The mean values ± SD for the AC parameters were: ACD 3.29mm ± 0.27mm; ACV 123 mm3 ± 49.05mm3; Temporal Angle ACD 37.58º± 2.83º; Superior Angle ACD 36.71º± 4.05º; Nasal Angle ACD 37.17º± 3.19º and Inferior Angle ACD 38.55º± 3.71º. Conclusion Galilei device allows a noninvasive measurement of different AC parameters. These data provides benchmark information that can be used to monitor and assess clinical practice; besides pachymetry is found to be a highly repeatable parameter.