VISION AND THE TECHNIQUE OF ART. 



31 



The validity of that work, however, is put in question for reasons given 

 in the article on "Dioptrics of the Eye" 12 by Dr. Proctor and Mr. 

 Ames. 



As far as is known no quantitative measurements, with one exception 

 which will be considered later, have been made of the color sensitivity 

 of different parts of the retina. The late Dr. J. W. Baird and Mr. 

 Ames undertook to make such measurements at Clark University in 

 1913, but found that the aberrations of the lens system of the eye 

 would first have to be determined. This led to the work described in 

 "Dioptrics of the Eye." Mr. Ames hopes to carry out these quanti- 

 tative measurements later. 



6 8 



^o 



3«. 46 



** -*e 



56 fco G4-66 



Figuee 37. Curves showing sensitivity of the retina in various parts to 

 light of different color. 



Dr. Baird and Mr. Ames did find that blue appeared much more 

 saturated on the periphery than it did on the fovea. This is in con- 

 formity with measurements made by Abney. 13 He measured the 

 sensitivity of the retina to lights of different wave lengths both at the 

 fovea and at an angle of ten degrees. His results are shown in Figure 

 37. It will be seen that blue appears brighter at ten degrees than at 



12 Loco Set. 



13 "Researches in Color Vision," p. 94, Longmans Green & Co., 1913. 



