US Patent 11792500 Eyewear determining facial expressions using muscle sensors

Eyewear having a sensor configured to sense electrical signals generated from user muscle movements to determine user facial expressions. The facial expressions are processed to provide a user input to the eyewear, to take an action such as taking an image using a camera, and to determine a user biometric such as by performing an electrocardiogram (ECG or EKG). In an example, a user can raise an eyebrow to instruct the eyewear to take an image, and squint an eye to lighten/darken a shade of an optical element.