#color_blindness__colorblindnes__colour_blindness__color_vision_deficiency__colour_vision_deficiency  genetic inability to distinguish differences in hue
  supertype:  #visual_impairment  #birth_defect
  subtype:  #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)
     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
  subtype:  #monochromacy__monochromatism__monochromatic_vision__monochromaticvision__monochromia__monochromasy  complete color blindness; colors can be differentiated only on the basis of brightness

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