a more compact new instrument to serve both functions application_number US 20606680 A description illustrative embodiments of the invention are shown in the accompanying drawings and will be described in further detail in said drawings fig1 is a diagrammatic sectional view of a first instrument which illustrates a fundus camera with which a photo slit lamp illuminating group has been combined fig2 is a plan view of the instrument shown in fig1 and fig3 is a diagrammatic sectional view of a second combination and more compact combination instrument in which slit lamp illumination is integrated into the illumination of a fundus camera in fig1 reference numeral 1 designates the the illumination group of a photo slit lamp such as described for instance in prospectus 30241 d ma iii 74 noo of the carl zeiss company and numerals 2 and 3 designate components of a known fundus camera as for example that known from carl zeiss prospectus 30 245 1 d ma x 77 koo or from german published application 2 741 992 offenlegungschrift the illumination group and the observation group being combined as the component unit 3 and the ocular head being the other component unit 2 the photo slit lamp illumination group 1 is shown selectively and mechanically coupled with the fundus camera 2 3 via a connecting part 4 this coupling is such as to provide an axial offset of the fundus camera away from the eye 11 of the patient whereby the objective 12 of the fundus camera is focused on anterior portions of the eye in the ocular head 2 of the fundus camera a reflecting mirror 13 is provided to deflect the observation ray path either onto a documentation device 14.