[The slit-lamp as operating microscope a personal device (author's transl)].

Instead of the operating doublemicroscope described by Harms the Zeiss slit-lamp was suspended on the microscope stand by means of two special couplings in form of two stairs, so that the biomicroscopy in the optic section can be performed also when operating, especially in surgery of the retina when using contact glasses. This improvisation is a cost saving alternative against the newly commercially available operating slit-lamp.