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September 1954

THE H-R-R POLYCHROMATIC PLATES: Comparison of Qualitative and Quantitative Classifications by H-R-R Plates and Other Tests

Author Affiliations

From the Knapp Memorial Laboratories, Institute of Ophthalmology, and Columbia University College of Physicians and Surgeons.
Dr. Hardy died April 14, 1954.

AMA Arch Ophthalmol. 1954;52(3):353-368. doi:10.1001/archopht.1954.00920050355003

THIS IS our second report of investigations dealing with the H-R-R Polychromatic Plates. It is based on a study of 150 subjects known to have defective red-green vision and presents a comparison of the qualitative and quantitative diagnoses yielded by this test with the performance of these subjects on other tests of color vision in present usage.

The H-R-R Plates were designed to detect and analyze anomalies of both redgreen and blue-yellow vision. The principles underlying the construction of the individual plates and the method of utilizing the entire series of plates for the diagnosis of color vision were described in some detail in our first report.1 In that report was also presented an evaluation of the test as a device (a) for screening persons with defective red-green vision from those with normal color vision, (b) for classifying the type of defect, and (c) for estimating its extent. Further,