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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). Certain Many HMDs are stereoscopic, and as such as , have displays over both of their users' eyes, like the [[Oculus Rift]] or and [[HTC Vive]] have displays over both of their users' eyes. Others Other HMDs like the [[Google Glass]] only have a display over one of the usersuser' 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.
