A focal point generated by a confocal sensor system is moved along a visual axis, orthogonal to the x, y-plane of an x, y, z-coordinate system, to a target z-coordinate of a point to be measured on a surface of an object. In order to avoid an edge processing with subsequent washing, the process according to the invention is carried out as follows: a crude glass plate is produced; the glass plate is cut to the desired size; the cutting-to-size is done by means of a laser; after the cutting-to-size the glass plate is prestressed andor bent. For instance, in some embodiments, the space is a graph that includes points, lines, and surfaces.