#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

No statement uses or specializes #optical_instrument; click here to add one.