A new phenotype? Nagel ‘dichromats’ who reject ‘red matches green’ for a 2° field

摘要: Population statistics on the relative frequencies of different red–green deficiencies are based diagnoses using Nagel anomaloscope with a 2° field. However, colour range is insufficient for secure diagnosis true dichromacy. Tests field have revealed, in group 12 classical ‘Nagel dichromats’, three deutans who cannot match Rayleigh red and green stimuli each other. This subgroup characterized by matching intermediate between widest available Nagel’s greatest achievable The incidence complete dichromacy may be overestimated anomaloscopy.