#hearing_impairment__hearingimpairment__hearing_loss  impairment of the sense of hearing
  supertype:  disability__disablement__handicap__impairment  the condition of being unable to perform as a consequence of physical or mental unfitness; "reading disability"; "hearing impairment"
  subtype:  deafness  partial or complete loss of hearing
     subtype:  tone_deafness  an inability to distinguish differences in pitch
     subtype:  deaf-mutism__deaf-muteness  congenital deafness that results in inability to speak
  subtype:  conductive_hearing_loss__conduction_deafness__middle-ear_deafness  hearing loss due to problems with the bones of the middle ear
  subtype:  sensorineural_hearing_loss__nerve_deafness  hearing loss due to failure of the auditory nerve

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