A ophthalmic lens having an electronic system is described herein for detecting blinks using at least one transducer emitting a sound pressure wave(s) to be reflected from the inside of the eyelid when the wearer is blinking or otherwise has his/her eyelid closed. The ophthalmic lens in further embodiments may communicate with a second ophthalmic lens to confirm the detection of a blink. In at least one embodiment, the ophthalmic lens includes at least one ultrasound module having at least one transducer such as a pair of transmit and receive transducers, a transceiver transducer or a plurality of transducers. The ultrasound module includes additional components for the creation and reception of the sound pressure wave(s). The ophthalmic lenses may be contact lenses or intraocular lenses.
