#optical_instrument__opticalinstrument  an instrument designed to aid vision
  supertype:  instrument  a device that requires skill for proper use
  part:  lens_system
  subtype:  binocular__fieldglasse__operaglasse  an optical instrument designed for simultaneous use by both eyes
  subtype:  esophagoscope__oesophagoscope  an optical instrument for examining the inside of the esophagus
  subtype:  jeweler's_glass  an optical instrument used by jewelers; has one or more lenses and is used to view features not readily seen
  subtype:  periscope  an optical instrument that provides a view of an otherwise obstructed field
  subtype:  projector  an optical instrument that projects an enlarged image onto a screen
     subtype:  epidiascope  a projector for images for both transparent and opaque objects
     subtype:  movie_projector__cine_projector__film_projector  projects successive frames from a reel of film to create moving pictures
        subtype:  bioscope  a kind of early movie projector
     subtype:  overhead_projector  a projector operated by a speaker; projects the image over the speaker's head
     subtype:  slide_projector__slideprojector  projector that projects an enlarged image of a slide onto a screen
        subtype:  magic_lantern__magiclantern  an early form of slide projector
  subtype:  sight.optical_instrument  a optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument
     subtype:  bombsight  a sighting device in an aircraft for aiming bombs
     subtype:  gunsight  a sight used for aiming a gun
        subtype:  battlesight  an arrangement of sights that makes possible the rapid aiming of a firearm at short ranges
        subtype:  open_sight  rear gunsight having an open notch instead of a peephole or telescope
        subtype:  panoramic_sight__panoramicsight  gunsight (a telescopic device for an artillery piece) that can be rotated horizontally in a full circle
        subtype:  peep_sight  rear gunsight having an adjustable eyepiece with a small aperture through which the front sight and the target are aligned
        subtype:  telescopic_sight__telescope_sight  gunsight consisting of a telescope on a firearm for use as a sight
  subtype:  spectacles__specs__spec__eyeglasses__glasses  optical instrument consisting of a pair of lenses for correcting defective vision
     subtype:  goggles  spectacles worn to protect the eyes
     subtype:  lorgnette  eyeglasses that are held to the eyes with a long handle
     subtype:  pince-nez__pincenez  spectacles clipped to the nose by a spring
     subtype:  sunglasses__dark_glasses__shades  spectacles that are darkened or polarized to protect the eyes from the glare of the sun; "he was wearing a pair of mirrored shades"
  subtype:  prism_spectroscope__prismspectroscope__spectroscope  an optical instrument for spectrographic analysis
     subtype:  mass_spectrometer__spectrometer  spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer
        subtype:  mass_spectrograph  a mass spectrometer that produces a graphical representation of the mass spectrum
     subtype:  spectrograph  a spectroscope by which spectra can be photographed
        subtype:  sound_spectrograph__soundspectrograph  a spectrograph for acoustic spectra

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