The HRR pseudoisochromatic plate (pip) test was originally designed
as a screening and diagnostic test for color vision deficiencies. The
original HRR test is now long out of print. We evaluate here the new
4th edition of the HRR test, produced in 2002 by Richmond Products. The
2002 edition was compared to the original 1955 edition for a group of
subjects with normal color vision and a group who had been previously
diagnosed as having color vision deficiencies. The color deficient
subjects spanned the range of severity among people with red-green
deficiencies except for one individual who had a mild congenital tritan
deficiency. The new test compared favorably with the original and in at
least two areas, outperformed it. Among subjects with deutan defects
the classification of severity correlated better with the anomaloscope
results than the original; all the subjects who were classified as
dichromats on the anomaloscope were rated as “severe” on
the new HRR, while those diagnosed as anomalous trichromats were rated
as mild or medium on the new test. Among those with moderate and severe
defects the new test was highly accurate in correctly categorizing
subjects as protan or deutan. In addition, a mild tritan subject made a
tritan error on the new test whereas he was misdiagnosed as normal on
the original.