#blindness__blindnes__sightlessnes  lack of sight
  supertype:  #visual_impairment__visual_defect__vision_defect__visual_disorder  impairment of the sense of sight
  subtype:  #anopia  sightlessness (especially because of a structural defect in or the absence of an eye)
  subtype:  #snowblindness__snowblindnes  temporary blindness caused by exposure to sunlight reflected from snow or ice
  subtype:  #eyelessness__eyelessnes  blindness due to loss of the eyes
  subtype:  #figural_blindness__figuralblindnes  inability to see shapes and contours

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