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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. 15.

Fig. 15

Left: Loci of the achromatic point of a 71-year-old observer before and after cataract extraction plotted in CIE x, y coordinates. Each datum is labeled according to the day the measurement was made relative to the surgery date. The open symbol represents the presurgery setting specified at the retina, calculated from measurements of ocular media density. The asterisk is the chromaticity of CIE Illuminant D65. Some settings have been omitted for clarity, but all follow the pattern shown. Error bars denote ±1 SEM. Center: Achromatic point of the same observer’s fellow eye with measurement dates referring to the test eye. Data from [197]. Right: Data from the two left panels (same color coding) plotted in cone excitation space following the axis normalization of Webster and Mollon [198]. Blue contour shows phases of daylight illumination.