Metrics for describing the color rendering characteristics of light sources are based on CIE standard observers. However, the range of natural variation in color sensitivity over people with normal color vision means any individual may see something different than the standard observer. Modeling results quantify the effects of these inter-observer differences on color rendering metrics CIE 13.3 (CRI) and IES TM-30-15. Inter-observer differences are smallest at high color fidelity values and generally larger for light source spectra with steep transitions and narrow peaks.
Michael J. Murdoch, Mark D. Fairchild, "Effects of Inter-Observer Variation on Color Rendering Metrics" in Proc. IS&T 24th Color and Imaging Conf. , 2016, https://doi.org/10.2352/ISSN.2169-2629.2017.32.187