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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. 3.

Fig. 3

Top left: Data points show the difference spectrum for sensitivity measured foveally and parafoveally under conditions described in the text. The smooth curve is the MP density spectrum from Wyszecki and Stiles [68] adjusted by a scalar for comparison with the data points. Bottom left: Density of the MP plotted as a function of retinal eccentricity fitted with an exponential function. Right: Optical density of MP plotted as a function of age from two studies indicated by different (overlapping) symbols. All data from [53,69].