36 AMES, PROCTOR AND AMES. 



antagonism of the visual fields which suppresses one set of images, and 

 to other physiological factors. Our impression, however, is probably 

 more like the effects shown in Figure 41 than like a monocular impres- 

 sion, as is shown by the greater effect of depth, less flat appearance of 

 Figure 41 as compared with Figure 42. 



SUMMARY. 



It is well known among artists that a different effect is produced 

 from painting with one eye than with two and that to get satisfactory 

 results two eyes must be used. There are unquestionably certain 

 effects in the binocular impression that can be reproduced in a single 

 photograph and still further effects that can be reproduced in a paint- 

 ing, where factors such as antagonism of the visual fields can be dealt 

 with. There are other effects due to ocular movements which cannot 

 be reproduced in a single picture but which may be possible of repro- 

 duction in motion pictures. 



Chapter VII. 

 GENERAL SUMMARY AND DISCUSSION OF RESULTS. 



From the foregoing description of the characteristics of retinal 

 images of objects in various parts of the visual field it is possible to 

 determine fairly definitely the nature of the retinal picture as a whole. 

 It can be described, in general terms, as being a picture in which ob- 

 jects at the center of interest, or focus point, are depicted in consider- 

 able detail, but not with microscopic detail. 



Objects in the field of Anew, nearer or farther from the observer than 

 the center of interest, are depicted with less detail and with chromatic 

 edges the color of which depends upon the position of the objects 

 relative to the center of interest. 



Objects lying to one side of the line of vision are also less clearly 

 depicted, the lack of clearness increasing with the angle of obliquity, 

 the accentuation of detail and edges in such objects depending upon 

 their position relative to the center of interest. Speaking generally 

 this accentuation is in a tangential direction if the objects are situated 

 nearer to the observer than the center of interest and in a radial direc- 

 tion if they are on the plane with or behind it. Such oblique objects 

 also have characteristic chromatic edges depending upon their position 

 relative to the center of interest. 



