title: Pseudoisochromatic plate design--Macbeth or tungsten illumination?
abstract: Three sets of pseudoisochromatic plates were evaluated by photometry and colorimetry. The luminance contrast between the figure and background was measured and compared with a contrast detection threshold. The chromaticity coordinates of the figure and background were evaluated on the basis of how closely they approached a dichromatic line of confusion. The separation of the coordinates of the figure and background are a measure of the severity of the defect for which the plate tests. The plates were evaluated under both Macbeth (C) and tungsten (A) illuminants; two sets of plates were found to be better designed for tungsten illumination.
mesh_terms: D003119:Color Perception Tests / Q000295:instrumentation / Q000379:methods*; D003117:Color Vision Defects / Q000175:diagnosis*; D004056:Differential Threshold; D006801:Humans; D008029:Lighting