Ophthalmoskop

1,260,319. Ophthalmoscopes. OPTOTECHNIK. G.m.b.H. Oct.6, 1969 [Nov.23, 1968], No.48992/69. Heading G2J. In an ophthalmoscope, Fig.1 one lens e.g. 23 mounted on a rotatable wheel containing a plurality of lenses is interposed in the reflected beam between the patient and the examiner and indicidia denoting the type of lens interposed are illuminated by the lamp 1 via a plastic light conducting member 4. Another wheel 7 rotatable about the light conducting member 4 is provided containing a plurality of field diaphragms and/or colour filters each of which may be interposed in the primary beam from lamp 1. The rotation and subsequent interposition of lenses, diaphragms and filters into the optical path is controlled by separate click-stop mechanisms, one for each wheel, Figs.2, 3 (not shown) comprising a ball (26, 11) urged by a spring (25, 13) into one of the lens bores (22, 10) of the wheel (14, 7). The optical parts of the device are externally protected by a slidable diaphragm 18 which may contain a colour filter or a lens. Similarly, the eyepiece lens 23 is protected by a plane glass disc 21 which lies in a countersunk opening in the rear housing 20.