title: Color-discrimination threshold determination using pseudoisochromatic test plates.
abstract: We produced a set of pseudoisochromatic plates for determining individual color-difference thresholds to assess test performance and test properties, and analyzed the results. We report a high test validity and classification ability for the deficiency type and severity level [comparable to that of the fourth edition of the Hardy-Rand-Rittler (HRR) test]. We discuss changes of the acceptable chromatic shifts from the protan and deutan confusion lines along the CIE xy diagram, and the high correlation of individual color-difference thresholds and the red-green discrimination index. Color vision was tested using an Oculus HMC anomaloscope, a Farnsworth D15, and an HRR test on 273 schoolchildren, and 57 other subjects with previously diagnosed red-green color-vision deficiency.
authors.affiliation: Department of Optometry and Vision Science, Faculty of Physics and Mathematics, University of Latvia Riga, Latvia.
authors.forename: Kaiva
authors.initials: K
authors.lastname: Jurasevska
authors.affiliation: Department of Optometry and Vision Science, Faculty of Physics and Mathematics, University of Latvia Riga, Latvia ; Institute of Solid State Physics, University of Latvia Riga, Latvia.
authors.forename: Maris
authors.initials: M
authors.lastname: Ozolinsh
authors.affiliation: Department of Optometry and Vision Science, Faculty of Physics and Mathematics, University of Latvia Riga, Latvia ; Institute of Solid State Physics, University of Latvia Riga, Latvia.
authors.forename: Sergejs
authors.initials: S
authors.lastname: Fomins
authors.affiliation: Department of Optometry and Vision Science, Faculty of Physics and Mathematics, University of Latvia Riga, Latvia.
authors.forename: Ausma
authors.initials: A
authors.lastname: Gutmane
authors.affiliation: Faculty of Biology, University of Latvia Riga, Latvia.
authors.forename: Brigita
authors.initials: B
authors.lastname: Zutere
authors.affiliation: Department of Optometry and Vision Science, Faculty of Physics and Mathematics, University of Latvia Riga, Latvia.
authors.forename: Anete
authors.initials: A
authors.lastname: Pausus
authors.affiliation: Institute of Solid State Physics, University of Latvia Riga, Latvia.
authors.forename: Varis
authors.initials: V
authors.lastname: Karitans
keywords: color measurement; color perception; color vision; color-vision defects; color-vision deficiency; psychophysics; vision system