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The focus of OST-HMDs such as the Hololens and Magic Leap 1 is usually set to about 1 or 2 meters in front of the face.
[[Vuzix]] is a provider of OST-HMDs.
Optical [[head-mounted display]] can cover only 1 eye such as the [[Google Glass]] or both eyes. Wearers can interact with the projected digital content through input methods such as voice commands, gestures and controllers.
