The eyeglasses (1) with high flexibility in use comprise a system for measuring the wearer's heart rate, the measuring system comprising a microcontroller (11), at least one heart rate sensor (12), means (13) for generating a visual and/or audible signal correlated to the measured heart rate, and an autonomous electrical power source (14), the measuring system further comprising adjustable means for positioning the sensor (12) against an anatomical area suitable for measuring the heart rate.
