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We evaluated the usefulness of the Waggoner Hardy-Rand-Rittler pseudoisochromatic plate (W-HRR) in subjects with anomalous trichromacy of congenital red-green color blindness. Materials and Methods: Sixteen protanomals and 38 deuteranomals who were diagnosed with a Nagel Type I anomaloscope were examined using the Richmond HRR pseudoisochromatic plate (R-HRR) and the W-HRR. The results of the W-HRR were then compared with the results of the R-HRR