US Patent 11237409 Wearing detection module for spectacle frame

A wearing detection module configured to be fixed on a spectacle frame element of a smart spectacle frame, the spectacle frame element including a first surface configured to face the wearer when using the smart spectacle frame and a second surface opposed to the first surface, and the wearing detection module including a pair of sensors configured to measure one parameter indicative of the distance between the spectacle frame element and the wearer, one sensor is arranged on the first surface and the other one is arranged on the second surface, and a processing unit configured to receive data indicative of the parameter sensed by each sensors and to determine a wearing data indicative of the use by the wearer of the smart spectacle frame based on the received data.