An eye tracking apparatus (2) comprising a target display (4) adapted to project a moveable image of a target into a user's field of vision, an illumination source (20a, 20b) adapted to project a reference point onto a user's eye (12) and a sensor (26) adapted to monitor a user's eye (12), and a processor adapted to determine the position of a feature of a user's eye relative to the reference point. Calibration of the eye tracking apparatus can be avoided through an advantageous arrangement of the target display and the eye sensor within the eye tracking apparatus, such that the sensor images the user's eye along the target direction. Thus the information gathered at the sensor concerning the relative positions of the reference point and the user's eye is by itself sufficient to determine the user's eye direction relative to the target.
