1. A method for measuring at least one morpho-geometric parameter of an individual wearing spectacles, said method employing a stand-alone information-processing device having a screen, a target, an image-acquisition system provided with a means for determining an inclination of the image-acquisition system and connected to said screen, and a processor allowing the image-acquisition system to be controlled and the images obtained to be processed, said method comprising the steps of: adjusting the inclination of the image-acquisition system so that the image-acquisition system remains in a permissible angular range, said image-acquisition system compensating for the inclination, so as to obtain an image of the eyes of the individual, which image is always centered on the screen whatever the inclination of said image-acquisition system in the permissible angular range, the compensating being based on an image-processing software package that selects, in the image obtained by the image-acquisition system in which image the face of the individual appears off-center, a zone around the eyes of the individual and a frame of the spectacles, and moves said zone to the center of said screen; adjusting a height of the image-acquisition system so that the individual can view the target along a substantially horizontal vision axis; the individual observing the target with the spectacles occupying a natural position on the face of the individual; providing an enclosure on the screen, the enclosure appearing on the screen as a rectangle of constant size; acquiring at least one image of the eyes and of the frame in said observation position by mean of the image-acquisition system, when the eyes and the frame fit inside the enclosure; processing said at least one image using the processor in order to determine each morpho-geometric parameter of the individual from the position of pupils of the individual and the inclination of the spectacles; and returning the results of the measurements.