An eye-mountable device includes an enclosure material shaped to be removably mounted over a cornea and to permit eyelid motion when the enclosure material is so mounted. The eye-mountable device also includes a tactile sensor system, including one or more pressure-sensitive sensors, disposed within the enclosure material and coupled to output a signal in response to pressure applied to the one or more pressure-sensitive sensors by a user. A controller is disposed within the enclosure material and electrically coupled to the tactile sensor system to receive the signal and, in response to the signal, control at least one other piece of circuitry in the eye-mountable device.
