Eye Movements and Vision by Alfred L. Yarbus (auth.)

By Alfred L. Yarbus (auth.)

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Higgins and Stultz (1953), in order to study eye movements during fixation, photographed a magnified image of a blood vessel of the sclera on a moving film. The optical system of the apparatus magnified the vessel 26 times, and the vessel was chosen so that its image was perpendicular to the aperture of the apparatus. The part of the sclera containing the vessel to be photographed was illuminated with ultraviolet light. For the control observations of the head movement, a marker fixed to the subject's nose was recorded at the same time.

The reflected light beam reproduces the eye movements and records them on photosensitive material. During the experiment the subject's head is held in a headrest. The lids of the anesthetized eye are taped open with strips of adhesive plaster, or the experimenter holds them open with his hands. Several methods are known for affixing a mirror to the eye. Marx and Trendelenburg (1911) glued the mirror to an aluminum cup resembling a contact lens. The cup together with the mirror was attached to the eye like a contact lens.

The distance between diaphragm 4 and the frame is 1 mm. The diameter of the aperture 5 in the upper part of the frame is 3 mm. A round transparent glass 6 with the lens 7 is fixed to the cylinder 3 around its entire perimeter. 20 mm thick. The diameter of the lens is 2-3 mmand its focal length 5-8 mm. The cylinder 3 is so made that it removes the glass with the lens a short distance from the eye and thus prevents it from becoming steamed up. A round wooden rod 8 is fixed to the frame of the cap and the cylinder.

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