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
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