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VR HMDs have displays with large [[field of view]] (FOV) that comprise the entirety of the user's vision. With both eyes, humans have about 180 degrees FOV. The display of a VR device should cover as much of the vision range as possible. A large FoV is important to create [[immersion]] for the wearer.
===Stereoscopic 3DImagery===The HMD has to create the illusion of a 3D world. To accomplish this, the display shows both of our eyes the same scene viewed from slightly different angles. This process creates depth perception by mimicking how our eyes perceive the world in real life.
===Rotational Tracking===
