#optical_instrument__opticalinstrument  an instrument designed to aid vision
  supertype:  instrument  a device that requires skill for proper use
  subtype:  binocular  esophagoscope  jeweler's_glass  periscope  projector  sight.optical_instrument  spectacles  prism_spectroscope
  part:  lens_system__lens  a transparent optical device used to converge or diverge transmitted light and to form images

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