Abstract
Gaze information such as gaze points, fixations points, saccades are valuable information that provide clues to reveal visual characteristics of subjects on proceeding psychological experiments, marketing, and visual field inspections. However, the gaze data derived from today’s eye trackers is limited to two-dimensional form, whereas studies on higher order visual processing need three-dimensional of gaze data to enable observations on processing spatial location and its relationship to the visual components. In this study, we have developed an eyeglass-type eye tracker based on vergence eye movements, which enable three-dimensional gaze measurements and investigate the spatial characteristics of the gaze for given points in a three-dimensional space. To ensure vergence eye-movements during gaze calibration, our eye tracker adopted gaze calibration in a three-dimensional virtual space displayed on a 3D display. Our experiment results show significant correlation between gaze points in the real and the virtual space. Moreover, gaze calibration using 3D display is found to be effective on forcing vergence eye-movements to yield reliable three-dimensional gaze measurements.
