Method for accurate determination of centring data of a subject for fitting spectacles to the subject using - an electronic image recording device having at least two cameras, - a mirror arranged vertically in the room, and opposite and at the eye-height of the subject, whereby the subject wears an anatomically well-fitted spectacle frame, and - a data processing and data output device, in which the parameters of the spectacles and of the spectacle frame, in the following referred to as "spectacle frame data", are stored, whereby at least the area with the spectacle frame of the face of the subject is photographically acquired by the electronic image recording device, the obtained image data are compared with the spectacle frame data stored in the data processing and data output device and the required centring data determined and output as measured values of the spectacles related to the subject by means of software stored in the data processing and data output device, characterised in that, - a stereo camera system is used as electronic image recording device that is fixedly disposed within the height of and symmetrically with respect to the central longitudinal axis of the mirror and the cameras of which have fixedly defined optical axes, - the correction data of the cameras of the stereo camera system, their image scales and information about their position in the room are also additionally stored in the data processing and data output device, - the subject directs his view onto the mirror image of his head in the virtual image plane, looking himself in the eyes, - from this moment the cameras of the stereo camera system take an image at least of the area of the head provided with the spectacle frame of the subject and - the direction, distance away and height-related position of the obtained image data are determined by means of the software and using the stored correction data, image scales and position information, whereby existent positionally dependent dimensional changes and distortions are countered through correction calculations. - an electronic image recording device having at least two cameras, - a mirror arranged vertically in the room, and opposite and at the eye-height of the subject, whereby the subject wears an anatomically well-fitted spectacle frame, and - a data processing and data output device, in which the parameters of the spectacles and of the spectacle frame, in the following referred to as "spectacle frame data", are stored, whereby at least the area with the spectacle frame of the face of the subject is photographically acquired by the electronic image recording device, the obtained image data are compared with the spectacle frame data stored in the data processing and data output device and the required centring data determined and output as measured values of the spectacles related to the subject by means of software stored in the data processing and data output device, characterised in that, - a stereo camera system is used as electronic image recording device that is fixedly disposed within the height of and symmetrically with respect to the central longitudinal axis of the mirror and the cameras of which have fixedly defined optical axes, - the correction data of the cameras of the stereo camera system, their image scales and information about their position in the room are also additionally stored in the data processing and data output device, - the subject directs his view onto the mirror image of his head in the virtual image plane, looking himself in the eyes, - from this moment the cameras of the stereo camera system take an image at least of the area of the head provided with the spectacle frame of the subject and - the direction, distance away and height-related position of the obtained image data are determined by means of the software and using the stored correction data, image scales and position information, whereby existent positionally dependent dimensional changes and distortions are countered through correction calculations.