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A stereoscopic countershaft worked out by the authors is cooperating with stereoophthalmoscope model 110. The element of the binocular with its original lenses used in the countershaft was supplemented with prisms which rectify the distance of the geometrical centres of the pictures on the frame of a 35 mm film. A vertical central screen prevents the half-pictures to overlap. The length of the optical path beyond the stereoophthalmoscope amounts 130 mm. Simultaneous stereograms of the eye fundus received by means of this construction are characterized by a transversal enlargement 1.3 X, 1.65X and 3.3X.
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