Abstract: What is described here is a method of manufacturing a spectacle lens in which the critical thickness is to be minimized in particular, comprising the following steps of operation: initially, a spectacle lens finished on one side (blank) is manufactured with a predetermined outsides contour and a round outside contour in particular, one part is cut out from the blank, whose outside contour corresponds approximately to the contour of the spectacle lens, the cut-out part is joined with the edge part with an axial offset in such a way that the edge part serves as handle for the subsequent machining operations.

Abstract: What is described here is a method of manufacturing a spectacle lens in which the critical thickness is to be minimized in particular, comprising the following steps of operation:

Abstract: An attachment for a binocular microscope to provide appropriate correction for the ametropia, i.e., defective vision, of the user. The attachment includes a pair of holders which can be slipped over and frictionally held by the microscope's scope's binocular eyepiece tubes, each holder having a retainer for receiving and positioning respective eyeglass lenses appropriate for correcting the user's individual ametropia. Means are provided for preventing rotation of the eyeglass lenses when the microscope's binocular tubes are adjusted for the user's interpupillary distance, thereby maintaining the proper orientation of the lenses so that even astigmatism can be corrected. The attachment is applicable to binocular microscopes having oblique eyepiece tubes as well as those having conventional parallel eyepiece tubes.