Depth information is important for postural stability and is generated by Collections two visual systems: binocular and motion parallax.The effect of each type of parallax on postural stability remains unclear.We investigated the effects of binocular and motion parallax loss on static postural stability using a virtual reality (VR) system with a head-mounted display (HMD).A total of 24 healthy young adults were asked to stand still on a foam surface fixed on a force plate.
They wore an HMD and faced a visual background in the VR system under four visual test conditions: normal vision (Control), absence of motion parallax (Non-MP)/binocular parallax (Non-BP), and absence of both motion and binocular parallax (Non-P).The sway area and velocity in the anteroposterior and mediolateral directions of the center-of-pressure displacements were measured.All postural stability measurements were significantly higher under the Non-MP and Non-P conditions than those under the Control and Non-BP conditions, with no significant differences in the postural stability measurements between the Control and Non-BP conditions.In conclusion, motion parallax has a more prominent effect on static postural stability than binocular parallax, which clarifies the underlying mechanisms USB Type-C to DisplayPort of postural instability and informs the development of rehabilitation methods for people with visual impairments.