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. Author manuscript; available in PMC: 2017 Feb 28.
Published in final edited form as: J Opt Soc Am A Opt Image Sci Vis. 2016 Mar;33(3):A104–A122. doi: 10.1364/JOSAA.33.00A104

Fig. 13.

Fig. 13

The proportion of “blue” responses to 40 simulated Munsell chips on a CRT is plotted as a function of relative S-cone stimulation. Open and closed symbols represent younger and older groups, respectively. Mean S/(L+M) was calculated from psychophysical measures of ocular media density for each participant. Data from [171].