Effect of the sight line shift when a head-mounted display is used

The authors measured basic characteristics of visual perception when one uses a head-mounted display. They evaluated perception of location of the visual target before and after the sight line shift. During the sight line shift, the controlled visual target was moved. The subjects judged whether they perceived that the visual target moved or not. The results obtained reflect the effect of ocular parallax. The subjects judged that the permissible range of visual target shift showed bias. A small shift that moves in the same direction as the sight line shift is permitted. It can be explained by the considerations of ocular parallax and depth perception. Therefore, it is important to consider the sight line shift and ocular parallax when one uses a head-mounted display