Why Is There No Computer Based HRR? View Shopping Cart
Various firms have launched development efforts over the years to try to develop a computer version of a pseudoisochromatic-plate color vision test. There are several key technical problems, which hinder successful development of such a test, and which remain unsolved.
First, no reliable low cost method has been developed to calibrate the CMYK computer monitor so that the colors presented accurately align with the colors required for the test. Formulating the colors of the HRR 4th Edition plates was a particularly difficult problem, which required substantial effort before printing. The slightest error in reproduction of the color by any means would likely invalidate the results of the test.
Second, color monitors may not achieve the level of color saturation required by the pseudoisochromatic design. The following figure shows that the RGB color space of typical CRTs is significantly smaller than the visible color space. The color space needed to produce proper pseudoisochromatic test colors exceeds that available from the RGB color space, and the resultant image generated by the computer on a CRT screen or other modes of display, such as projection.
(Yellow Triangle represents the RGB color space. The Black outline represents the CMYK color space)
Colormetric Analysis of the Four Editions of the HRR (pdf)
Color Deficiency FAQ's
HRR 4th Edition Test - English Version
HRR 4th Edition Test - International Versions
HRR 4th Edition Test - Laminated
HRR 4th Edition Test - Subset Tests
HRR Accessories
HRR Illumination Specifications
HRR Product Development
HRR Technical Article
Tru-Daylight Illuminator
Color Vision Test Comparison Chart
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