| CPC G02B 27/0172 (2013.01) [A61B 90/37 (2016.02); G02B 6/003 (2013.01); G02B 6/005 (2013.01); G02B 7/022 (2013.01); G02B 7/14 (2013.01); G02B 27/0176 (2013.01); A61B 2090/372 (2016.02); G02B 2027/0152 (2013.01); G02B 2027/0159 (2013.01); G06F 3/011 (2013.01)] | 19 Claims |

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1. A head-mounted display device comprising:
a frame;
a head mounting assembly configured to retain the frame in a position on a head of a wearer, the head mounting assembly comprising at least one of a strap, a temple arm, or a forehead support;
a see-through display assembly comprising an at least partially transparent display that is configured to display to the wearer an image overlaid on a scene visible through the at least partially transparent display; and
a pantoscopic tilting assembly that pivotably couples the see-through display assembly to the frame such that a pantoscopic tilt angle can be adjusted, the pantoscopic tilting assembly comprising:
an arc-shaped slot that pivotably couples a portion of the see-through display assembly to a portion of the frame; and
a detent mechanism comprising a plurality of detents configured to selectively retain the see-through display assembly in any of a plurality of predefined positions with respect to the frame.
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