Correlation of Measurement Values Obtained Using Anterior Segment Measuring System Visante^TM

Abstract

Purpose: Anterior chamber measuring instruments employing various principles are available today. In this study, we measured central corneal thickness (CCT) and anterior chamber depth (ACD) in normal volunteers, using a recently developed optical measuring system: anterior chamber optical coherence tomography, Visante^TM (Carl Zeiss Meditec). We then considered its measurement accuracy.

Methods: We measured 24 eyes of 12 subjects (mean age: 31.0±4.3 (23–37) years) with no ocular diseases, but with refractive errors, using Visante^TM and Orbscan^®IIz (Bausch&Lomb). Each subject eye was measured five times with the two devices; CCT and ACD data were then compared.

Results: CCT was 524.6±1.9 μm and ACD was 3.625±0.02 mm, as measured by Visante^TM. In contrast, CCT was 553.5±5.3 μm and ACD was 3.562±0.03 mm, as measured by Orbscan^®IIz. This study confirmed high correlation and significant difference between the two devices.

Conclusions: The observed data confirmed correlation between Visante^TM and Orbscan^®IIz; which fact suggests that Visante^TM will be useful in biometric studies of the anterior chamber.