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A '''viewer''' is a gadget that holds an electronic gadget or gizmo such as a smartphone with a 2D display that has optics in it. When a gadget is in it, it becomes a two-view stereoscope. With [[IMU]]s in the gadget, it becomes a [[virtual reality headset]].
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A '''viewer''' is a physical object that can hold a smartphone or other device in it to create a [[head-fixed display]].
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When a gadget is in it, it becomes a two-view stereoscope. With [[IMU]]s in the gadget, it becomes a [[virtual reality headset]].
It enables a user to have a virtual reality experience by holding it close to the user's eyes.
It enables a user to have a virtual reality experience by holding it close to the user's eyes.