Simultaneous Long Term Measurement of Lens Accommodation and Convergence Using Real Objects, 2D and 3D Video Clips : Differences in the Mechanism of Stereoscopic Vision in Young and Elderly Subjects

Abstract

Human beings perceive three-dimensional objects with simultaneous convergence and lens accommodation in binocular vision. Virtual images are perceived via the same mechanism, although, as we previously reported, the focus is not always fixed on the surface of a display when stereoscopic images are being viewed. In this study, we developed a method to simultaneously measure accommodation and convergence in order to provide further support for this theory. We also measured accommodation and convergence in natural vision to confirm that these measurements are correct. Then, we measured simultaneously them in gazing 2D and 3D images.