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Illuminant and observer metamerism and the Hardy-Rand-Rittler color vision test editions

Published online by Cambridge University Press:  15 December 2006

STEPHEN J. DAIN
STEPHEN J. DAIN
Affiliation:
Optics and Radiometry Laboratory, School of Optometry and Vision Science, The University of New South Wales, Sydney, Australia
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Abstract

A previous study identified a significant metamerism in the several editions of the Hardy-Rand-Rittler pseudoisochromatic plates (HRR) but did not proceed to quantify the consequences of that metamerism (Dain, 2004). Metamerism arises from two sources and is almost inevitable when a printed color vision test is reproduced in several editions. Metamerism has two consequences; these are illuminant/source-based changes in performance and changes in performance with observer (less well known) when assessing anomalous trichromats. This study addresses the effects of illuminant/source and observer metamerism on the fourth editions of the HRR. Groups of colors intended to lie on a dichromat confusion line generally remain on a confusion line when the source is changed. The plates appear to be resistant to each form of metamerism, perhaps because the features of the spectral reflectance are similar for figure color and background gray. As a consequence, the clinician needs to be less concerned about using a non-recommended source than was previously believed.

Keywords

MetamerismColour visionColour vision tests
Type
TESTING AND METHODS
Information
Visual Neuroscience , Volume 23 , Issue 3-4 , May 2006 , pp. 685 - 694
Copyright
© 2006 Cambridge University Press

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