1940s.]. Boxed set, 130 x 110 x 75mm including a heavy cast iron model with moveable internal barrel, a set of 24 colour retinal images on 12 circular card discs housed within a separate lidded box 85 x 45 x 65, a small key card explaining the individual discs, and a stapled sixteen page instructional pamphlet by Dr Fisher, now folded into four, with the final page damaged and torn (through rubbing against the cast iron model), with some loss of the text though meaning still discernible; also retained an old and somewhat grubby optical cloth; two edges of eye disc box torn and split with further light wear; in the original drab cardboard box with printed label on one side, box a little scuffed and worn, with some edgewear; overall a good example of a seemingly scarce survivor. A seemingly later version of this ‘schematic eye’ model, designed by Dr William A Fisher (1860-1944), Professor of Ophthalmology and President of the Chicago Eye, Ear and Throat College, and designed to help students study ophthalmoscopy - the examination of the back part of the eye (fundus - including the retina, optic disc, choroid and blood vessels). Fisher first introduced his model in 1907, earlier models being more cylindrical, often made of brass, and including a stand. This ‘improved model’ is now made of heavy cast iron. It consists of one barrel working inside of another in such a manner that a long or short eye can be produced. The viewer has a lens to represent the crystalline lens of the human eye, and a diaphragm shutter to represent the iris that when fully open represents a pupil of 30 millimetres. When one of the 24 retina simulation disc is placed in the three pronged viewing holder, the student with an ophthalmoscope can then look inside the viewer as if looking into an eye. Though a little damaged, the set retains a copy of Fisher’s instructional booklet, which discusses each of the conditions represented on the discs and thus diagnosable with the Fisher eye. An unusual survivor.