title: Confusion points and constant-luminance planes for trichromats, protanopes and deuteranopes.
abstract: The confusion points of dichromats are derived from the constant-luminance planes of trichromats, protanopes and deuteranopes experimentally defined by heterochromatic-flicker photometry: (1) the zero-luminance planes of the observers considered in this experiment intersect almost exactly in a line that crosses the plane of the chromaticity diagram in the tritanopic-confusion point and confirm that the short-wavelength sensitive cones can be considered to have no contribution to luminance; (2) protanopic- and deuteranopic-confusion points are taken as being defined by the intersection of the tangent line to the long-wavelength region of the spectrum locus and the zero-luminance plane for protanopes and deuteranopes, respectively.
authors.affiliation: Physics Department (INFM-GNEQP), University of Parma, Italy. oleari@fisica.unipr.it
authors.forename: C
authors.initials: C
authors.lastname: Oleari
authors.forename: G
authors.initials: G
authors.lastname: Baratta
authors.forename: A
authors.initials: A
authors.lastname: Lamedica
authors.forename: C
authors.initials: C
authors.lastname: Macaluso
mesh_terms: D000221:Adaptation, Ocular; D003117:Color Vision Defects / Q000503:physiopathology*; D006801:Humans; D008433:Mathematics; D010783:Photometry; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology