title: Temporal variations in anomaloscope equations.
abstract: Temporal variations in the value of blue/green derived from the equation: 'Blue' + 'Green' = 'Cyan' + 'Yellow', seem to be of two kinds. Those found in a cross-sectional study of 167 normal eyes in the age range 13--83 years could be attributed to progressive changes in lens absorbance. Individual cyclic variations in short-term (12 h) and long-term (11 months) longitudinal studies could not be attributed to the lens.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D003119:Color Perception Tests / Q000295:instrumentation; D003117:Color Vision Defects / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D007908:Lens, Crystalline / Q000503:physiopathology; D008433:Mathematics; D008875:Middle Aged; D010507:Periodicity; D012168:Retinal Pigments / Q000502:physiology; D012621:Seasons
chemical_list: D012168:Retinal Pigments