The Field Of Distinct Vision PDF Download

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ... people, and he was at no apparent disadvantage in seeing the carrier on the perimeter at 90 degrees in the outer field. His color zones were the smallest I found, but they formed no break in series with those of the other subjects. His visual acuity was fully up to the average. He is a slow reader and makes 1 Op. tit., p. 14. 2 Cf. C. N. Mc Allister, 'Points of Fixation in the Visual Field', Psych. Rev., Mon. Sup. Vol. VII, No. 1, pp. 17-54. many eye movements per line, but in neither of these characteristics did he take lowest rank. After the foregoing data had been collected, an attempt was made to standardize the unit of vision that was used. I aimed to draw a hook that would give approximately the same results as the n and the u. After a number of failures, closely corresponding results were obtained with a hook that was essentially a square with one side open, having a length of side of one millimeter. The horizontal line in the letters was lighter than the vertical lines, and therefore harder to see, while in the hooks the lines were all of equal weight. This made it necessary to make the hooks smaller than the letters. The hooks were drawn with a fine (Gillott 170) pen, and black India ink, and the lines were about two-tenths of a millimeter wide. The hooks were faced like the n and the, one up and one down, and were exposed in the same manner. Data were obtained from three subjects. So as to make the comparison entirely fair, the letters were exposed alternately with the hooks. Five series of hooks were exposed and then five series of letters. The results are condensed in Table VIIIA. With the exception of one record, that of H. R. horizontal, the correspondence between the hooks and the letters is fairly close. In fact, ...