Head-Mounted Display

In virtual reality, a helmet containing two built-in screens, which are used to simulate a three-dimensional environment. By projecting each of the two images at slightly different angles, the illusion of 3D or stereoscopic vision can be produced. Sensors built into the helmet sense the movements of the user's head, and adjust the perspective of the images accordingly (known as head tracking). Often abbreviated HMD and also known as a visette.

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