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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). 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.