Minor defects in the 1931 CIE Standard Observer System, derived from 2° foveal viewing conditions, have increased interest in large parafoveal viewing fields. As the parafoveal region of the retina gives rod as well as cone responses, the CIE is considering a new observer system (recommended for adoption at the June 1963 CIE meetings in Vienna, Austria, by the Experts of Committee E 1.3.1) in which contributions of the rods to over-all vision have been removed so that the system reflects only the cone response. The author, a normal trichromat in 2° foveal vision, has measured his 10°-field color-matching functions on the Wright visual tristimulus colorimeter. These color-matching functions, reported here, are compared with other such data, and with data taken for foveal, parafoveal, and extrafoveal fields. The author’s 10°-field data confirm, with the retinal illuminance achieved in the Wright visual tristimulus colorimeter, that rod responses are an important part of the total visual response. It is concluded that rod responses should not be neglected in color-matching with retinal illumination less than 1000 trolands.
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