#lens_system__lens  a transparent optical device used to converge or diverge transmitted light and to form images
  supertype:  optical_device__opticaldevice  a device for producing or controlling light
  subtype:  anastigmat  anastigmatic_lens  camera_lens  compound_lens  optical_condenser  contact_lens  converging_lens  crown_lens  diverging_lens  eyepiece  Fresnel_lens  intraocular_lens  monocle  object_glass
  part of:  optical_instrument__opticalinstrument  an instrument designed to aid vision

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