Changes

A '''head-mounted display''' or '''HMD''' is a [[device]] worn on your head. It features a display in front of one or both of your eyes. The display streams data, images and other information in front of the wearer's eye(s). Many HMDs are [[stereoscopic]], and as such, have displays over both of their users' eyes, like the [[Oculus Rift]] and [[HTC Vive]]. Other HMDs like the [[Google Glass]] only have a display over one of the user's eyes.

A '''head-mounted display''' or '''HMD''' is a [[device]] worn on your head. It features a display in front of one or both of your eyes. The display streams data, images and other information in front of the wearer's eye(s). Many HMDs are [[stereoscopic]], and as such, have displays over both of their users' eyes, like the [[Oculus Rift]] and [[HTC Vive]]. Other HMDs like the [[Google Glass]] only have a display over one of the user's eyes.

The majority of [[Virtual Reality]] (VR) and [[Augmented Reality]] (AR) devices are head-mounted displays. In AR, the display is usually transparent and digital information is superimposed onto real life objects. These HMDs are called [[Optical head-mounted display]]s or [[OHMD]]s. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes.

The majority of [[Virtual Reality]] (VR) and [[Augmented Reality]] (AR) devices are head-mounted displays. In AR, the display is usually transparent and digital information is superimposed onto real life objects. These HMDs are called optical see through head mounted displays (OST-HMD). Video passthrough can also be done. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes.

To create the illusion of depth, a display is placed very close to the users' eyes, covering a large portion of their field of view. Most headsets are flat focus stereoscopic, meaning two images that are very similar but have different perspectives are channeled into the eyes, one for the left and one for the right, to allow the human perceptual system to perceive [[binocular disparity]] and see some depth.

To create the illusion of depth, a display is placed very close to the users' eyes, covering a large portion of their field of view. Most headsets are flat focus stereoscopic, meaning two images that are very similar but have different perspectives are channeled into the eyes, one for the left and one for the right, to allow the human perceptual system to perceive [[binocular disparity]] and see some depth.