Process and device for sensing the position in space of the optical axis of an eye

described is a device for detecting the spatial position of the optical Axis of the eye of a human or animal subject, as well as for centering a reference system relative to the optical axis, with at least one a parallel light beam emitting light source, an opposite the light source intended position area for the subject, means for relative positional alignment of the parallel light beam bundle with respect to the Eye of the test and at least one detector unit for the detection of in and on the eye caused by the parallel light beam reflection events.The Invention is characterized in that an evaluation unit provided is detected on the basis of the by the detector unit Scatter and reflection events generates control signals by the the means are driven for relative position orientation, the generation of the control signal is performed such that at least two Reflection events with respect to the propagation direction of the parallel light beam bundle in Coverage are to bring.