| CPC A61B 3/111 (2013.01) | 20 Claims | 

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               1. An eyewear device comprising: 
            a frame; 
                a processor configured to: 
                determine a deformation of the frame; and 
                  estimate an inter pupillary distance (IPD) of a user based on the determined frame deformation; and 
                a display coupled to the frame configured to display an image as a function of the estimated IPD. 
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