| CPC G02C 7/083 (2013.01) [A61B 3/0008 (2013.01); A61B 3/032 (2013.01); A61B 3/036 (2013.01); G02B 6/4204 (2013.01); G02B 7/023 (2013.01); G02B 7/09 (2013.01); G02F 1/13306 (2013.01); G06F 1/163 (2013.01); G02F 1/13439 (2013.01)] | 20 Claims |

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1. A head-mounted device comprising:
a housing having a lens mounting structure;
a display in the housing, wherein the display includes a pixel array configured to provide a display image;
a fixed lens that is mounted in the lens mounting structure of the housing and that overlaps the pixel array, wherein the lens mounting structure of the housing has an opening in which a removable lens is received, wherein a lens mounting ring of the removable lens is received within the opening of the lens mounting structure of the housing and the fixed lens is disposed between the pixel array and the removable lens when the removable lens is received in the opening of the lens mounting structure of the housing, and wherein the display image is viewable through the fixed lens and the removable lens when the removable lens is received in the opening of the lens mounting structure of the housing; and
first and second magnetic alignment structures on opposing sides of the opening of the lens mounting structure of the housing and configured to align and hold the lens mounting ring of the removable lens in rotational alignment with respect to the lens mounting structure of the housing, wherein the first and second magnetic alignment structures are configured to be magnetically attracted to third and fourth magnetic alignment structures on the lens mounting ring of the removable lens.
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