The effects of lens focus with varying stereoscopic depth cues on the eye fatigue level with viewing a binocular head-mounted display

People can suffer from eye fatigue and headache when viewing a stereoscopic binocular head-mounted display for a long period of time. One possible cause of eye fatigue is the mismatch between accommodation and vergence. For most binocular display, the projected distance of images (i.e., lens focus) is fixed while viewers are usually required to view stereo images with varying stereoscopic depth cues. This posts an unnatural demand on human eyes as the eyes are forced to fix their accommodate while the vergence eye movements are dynamically changing according to the stereoscopic depth cues. This paper reports a study conducted to investigate the levels of eye tireness caused by viewing binocular display with lens focus matched or unmatched with the stereoscopic depth cues. Preliminary results are presented in this paper and the full results will be presented at the symposium