HRR Illumination
Specifications
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The following paragraphs are excerpted from the Procedures for Testing
Color Vision Document ADA 113680 issued by the National Research Council.
Committee on Vision Assembly of Behavioral and Social Sciences published by the
National Academy Press, Washington D.C. 1981. This document is available
form the U.S. Department of Commerce, National Technical Information Service
5285 Port Royal Rd Springfield VA, 22161 Phone 703-487-4600. Comments added this
date are in parenthesis ().
Correct Illuminants
To demonstrate the importance of using the correct illuminant,
a number of investigators showed that if ordinary unfiltered tungsten lamps
(which appear yellower than Standard Illuminant C) are used, deutan subjects
make fewer errors in Pseudoisochromatic plate tests, including
the Ishihara, American Optical (now Richmond Products Green/Red) and HRR (also
Richmond) [Reed 1944, Hardy et al.; 1946, Volk and Fry, 1947; Farnsworth, Reed
and Chilling, 1948; Schmidt, 1952; Katavisto, 1961; and Higgins et al., 1978].
Therefore, deuteranomalous observers (deutans) may pass
a screening test that was administered under the wrong illuminant. With the
wrong illuminant, deutans may also make fewer errors in an arrangement test,
such as the FM 100-hue test or the Farnsworth panel D-15 (Both available from
Richmond Products). In addition, protans may show rotation of the error axis.
Extreme protanomalous trichromats and protanopes may even show a deutan profile
[Higgins et al, 1978]. Thus, unfiltered tungsten lamps cannot be used as
illuminates for these tests, since those lamps will not give correct results.
Ordinary window light is far too variable in both illuminance levels and
spectral composition to be an adequate source for color vision testing.
The use of fluorescent tubes in color testing has been investigated, with
variable results [Rowland, 1943]; Katavisto, 1961] . Ordinary commercially
available fluorescent tubes are not generally appropriate for testing color
vision.
(page 21)
HRR
4th Edition Technical Bulletin (pdf)
HRR Product Development
Color Vision Test Comparison Chart
Color Vision Test Index
HRR
4th Edition Test - English Version
HRR
4th Edition Test - International Versions
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