By Alfred L. Yarbus (auth.)
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Extra resources for Eye Movements and Vision
Example text
15; they are identical with the dimensions of caps of several different types of construction. The surface of contact of the cap with the eye is polished and corrugated. The corrugated surface prevents the cap from slipping over the eye. 25 g. Fig. 14. The P2 cap. 32 CHAPTER I Fig. 15. The P3 cap. The P4 cap is shown schematically in Fig. displacement of the retinal image is disturbed. The duraluminframe of the P 4 cap has the same dimensions as the frame of the P 3 ~odel. In the top part of the frame is a round aperture 1, with a diameter of 4 mm.
When records are made on moving photosensitive material (oscillographic paper), ordinary photokymographs are used. However, in the ordinary photokymograph the speed of the oscillographic paper does not exceed 20-30 cm/sec and the length of the slit is only 12-15 cm. However, when many eye movements are studied, speeds closer to 5 m/sec and slits 25-30 cm in length are necessary. These technical conditions are satisfied by a primitive and somewhat modified model of a photokymograph, the making of which presents no special difficulty and requires no detailed description.
During assembly it is important to select the correct tension of the diaphragm 4 and the membrane 9 and the correct transmitting capacity of the filter 12. It is, of course, easy to imagine a variant of the P 5 cap using a piezocrystal or any other suitable pickup. In this case, the recording of the pulsation could be made by means of an amplifier actuating a loop oscillograph. The scheme of the P s cap, which creates a stationary retinal image for the whole field of vision of the eye, is shown in Fig.