#visually_handicapped_person  someone handicapped by inferior vision
  supertype:  #handicapped_person__handicappedperson  a person who has some handicap that interferes with normal functions
  subtype:  #aphakic  someone afflicted by aphakia; someone lacking the natural lenses of the eyes
  subtype:  #blind_person__blindperson__blind_man__blindman  a person with a visual handicap severe enough to leave them unemployable
  subtype:  #hyperope  a person with hyperopia; a farsighted person
  subtype:  #myope  a person with myopia; a nearsighted person
  subtype:  #presbyope  a person with presbyopia; someone who is farsighted resulting from the progressive loss with aging of the elasticity of the crystalline lens

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