The device for measuring intraocular pressure, in particular a tonometer, has a base body which has a contact surface to be applied to the eye surface. A foot is attached to the first end and is slidable along the upright base panel in a direction generally normal to a plane of the bottom side between a first position and a second position. The portions are movable about the connections. There is a delay of a specific bit length between the first and the second differential input data streams. The first conductive semiconductor layer may have Al content higher than Al content of the active layer.