#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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