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By Sainani G. (ed.)

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Recording eye movements on still photographic paper or film is complicated. Let us assume that the cap is fixed to the eye. The cassette is still closed but ready to record. The room is dark. The visual test object, placed against a matt black background, is illuminated by a directed beam oflight but covered by paper so that the subject cannot see it before recording begins. Then the Fig. 24. Position of lids held by strips of adhesive plaster in work with all caps except type Pl. 46 CHAPTER I.

23, and the position of the lids for working with all other types of cap in Fig. 24. In the first case, as is clear from Fig. 23, the lids are retracted mainly towards the temporal part of the eye. In the second case, the adhesive plaster is stuck to the central part of each eyelid and the lids are retracted almost symmetrically relative to the optical axis. After the lids have been fixed, the subject places his head on the chin rest in the required position, and the experimenter applies the cap to the eye.

In the opinion of these authors, fixation on a point is accompanied by continuous movement of the eye and lens. Peckham (1934) and Ogle, Mussey, and Prangen (1949) used a stereoscope and telescopes to study changes in convergence during fixation on an object. Because of the creation of specially devised optical instruments the method of visual observations is still suitable for the study of certain types of eye movement today. However, the newer methods, which provide more objective records, have proved more accurate and therefore preferable.

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