Subjective evaluations on perceptual depth of stereo image and effective field of view of a wide-view head mounted projective display with a semi-transparent retro-reflective screen

We report two user studies on a wearable hyperboloidal head mounted projective display (HHMPD) with a semi-transparent retro-reflective screen. First experiment revealed that a virtual image is perceived at a similar distance as the real image only when the observation distance is within 2.5m with monocular vision, whereas its threshold is further than 3m with stereo (binocular) vision. Second experiment revealed that users are able to identify visual stimuli in the periphery of the visual field up to ±50 degrees in horizontal, while paying attention to a real object in frontal direction.