AO H-R-R (Hardy-Rand-Rittler) Pseudoisochromatic Plates 1 present for general use a comprehensive, inexpensive, and rapid test of color vision suitable for office, school, and clinic—a test which should be of considerable practical value. principles underlying the test and its unique features have been described in previous papers published in theArchives 2 under the title The H-R-R Polychromatic Plates. present paper is a brief report on our evaluation of the H-R-R Plates as made commercially available by the American Optical Company. report will deal only with the test as a device for analyzing red-green vision, since the number of subjects who have made errors in the blue-yellow series of plates is too small to warrant conclusions as to the value of the plates of this series. In the previous paper an evaluation was given of the H-R-R Polychromatic Plates (hereafter to be referred to as the