Abstract: A communication device has a carrier on which a picture emitting element, an optical system, and a light sensitive element are mounted. The carrier is positionable closely in front of and in a predetermined position with respect to an eye to be examined of a person. The optical system is arranged to direct an image of the eye on the light sensitive element. An evaluating unit is provided for evaluating direction information from the light sensitive element so as to generate a signal encoding the direction of the gaze of the person. The evaluating unit selects, from the image of the eye on the light sensitive element, at least two pieces of image information emanating from the eye of the person upon said light sensitive element, the mutual distance on the light sensitive element of which is a function of the angle made by the gaze direction of the eye with the optical axis of the optical system and substantially independent of small lateral displacements between the carrier and the eye of the person.