#dichromacy__dichromatism__dichromatopsia__dichromia__dichromasy  a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)
  supertype:  color_blindness__colorblindnes__colour_blindness__color_vision_deficiency__colour_vision_deficiency  genetic inability to distinguish differences in hue
  subtype:  red-green_dichromacy__redgreendichromacy__red-gree_color_blindness  confusion of red and green
     subtype:  deuteranopia__Daltonism__green-blindness  dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red
     subtype:  protanopia__red-blindness__redblindnes  dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue
  subtype:  yellow-blue_dichromacy__yellow-blue_color_blindness  confusion of yellow and blue
     subtype:  tetartanopia__yellow-blindness  a form of dichromacy characterized by lowered sensitivity to yellow light; so rare that its existence has been questioned
     subtype:  tritanopia__blue-blindness  rare form of dichromacy characterized by a lowered sensitivity to blue light resulting in an inability to distinguish blue and yellow

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