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An '''optical see-through head-mounted display''' is a type of head mounted display that uses optical see-through panels and projects light off of them or from them. It allows the user to see the real world and the displayed content layered on top.

A '''transparent display headset''' is a type of wearable technology product that is worn on the head and includes a display that is see-through. It uses optical see-through panels and projects light off of them or through them. It allows the user to see the real world and the displayed content layered on top.

'''OST-HMD''' stands for optical see-through head mounted display.<ref>Design of a Pupil-Matched Occlusion-Capable Optical See-Through Wearable Display https://ieeexplore.ieee.org/abstract/document/9416829</ref>

'''OST-HMD''' stands for optical see-through head mounted display.<ref>Design of a Pupil-Matched Occlusion-Capable Optical See-Through Wearable Display https://ieeexplore.ieee.org/abstract/document/9416829</ref>