we confirm a remarkable but forgotten property of human color vision that was described over 50 years ago by tyndall [ j. opt . soc . am 23 , 12 ( 1933 ) ] : if wavelength discrimination is measured in the region of 455 nm , the sensitivity of the eye improves when a large fraction of the monochromatic light in each half of the matching field is replaced by white light that is common to the two halves .
C0086032
color vision
C0015392
eye