A display system built into goggles that gives the illusion of a floating monitor in front of the user's face. Single-eye units are used to display hands-free instructional material, and dual-eye stereoscopic units are used for virtual reality applications. See heads-up display, body-worn computer and CAVE.
One Eye for Instructions
These earlier Xybernaut HMDs connected to voice-activated body-worn computers, allowing technicians to read instructions while working with both hands. (Images courtesy of Xybernaut Corporation.)
Both Eyes for Virtual Reality
Also used for gaming, stereoscopic goggles transport the user into another world. Here it is used to divert the patient in the dental chair. (Image courtesy of Virtual I-O.)