Do different people see the same color in different shades? Why?
While normal color vision (that is for observers who are not color blind) is very similar from person to person, there are differences large enough to be noticed. Most often this happens in color matching when one person sees two stimuli as a match and another does not. Simply put, these differences are caused by a number of physiological differences in the visual system (just like people are different in many other ways). Some of the causes are differences in the transmittance of the eye lens (which gets yellow with age and also varies from person to person), a protective yellow filter layer on top of our retinas, and the photoreceptor responses. In addition, there are also differences in the ways individuals assign names to various colors.
