Abstract

Clromatic sensitivity along the protan, deutan, and tritan lines and the loci of the unique hues (red, green, yellow, blue) for a very large sample (n = 185) of colour-normal observers ranging from 18 to 75 years of age are assessed. Visual judgments are obtained under normal viewing conditions using colour patches on self-luminous display under controlled adaptation conditions. Trivector discrimination thresholds show an increase as a function of age along the protan, deutan, and tritan axes, with the largest increase present along the tritan line, less pronounced shifts in unique hue settings are also observed. Based on the chromatic (protan, deutan, tritan) thresholds and using scaled cone signals, we predict the unique hue changes with ageing. A dependency on age for unique red and unique yellow for predicted hue angle is found. We conclude that the chromatic sensitivity deteriorates significantly with age, whereas the appearance of unique hues is much less affected, remaining almost constant despite the known changes in the ocular media.

© 2011 Chinese Optics Letters

Changes in unique hues induced by chromatic surrounds

Susanne Klauke and Thomas Wachtler
J. Opt. Soc. Am. A 33(3) A255-A259 (2016)

Investigating unique hues at different chroma levels with a smaller hue angle step

Wenyu Bao, Minchen Wei, and Kaida Xiao
J. Opt. Soc. Am. A 37(4) 671-679 (2020)

Discrimination thresholds of normal and anomalous trichromats: Model of senescent changes in ocular media density on the Cambridge Colour Test

Keizo Shinomori, Athanasios Panorgias, and John S. Werner
J. Opt. Soc. Am. A 33(3) A65-A76 (2016)

Loci of spectral unique hues throughout the life span

Brooke E. Schefrin and John S. Werner
J. Opt. Soc. Am. A 7(2) 305-311 (1990)

Empirical evidence for unique hues?

J. M. Bosten and A. E. Boehm
J. Opt. Soc. Am. A 31(4) A385-A393 (2014)