#eyepiece__ocular  combination of lenses at the viewing end of optical instruments
  supertype:  #lens_system__lens  a transparent optical device used to converge or diverge transmitted light and to form images
  part:  #reticle
  part of:  #binocular__fieldglasse__operaglasse  an optical instrument designed for simultaneous use by both eyes
  part of:  #light_microscope__lightmicroscope  microscope consisting of an optical instrument that magnifies the image of an object
  part of:  #optical_telescope__opticaltelescope  an astronomical telescope designed to collect and record light from cosmic sources
  part of:  #sight.optical_instrument  a optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument
     part of:  #firearm__piece__small-arm__smallarm  a portable gun; "he wore his firearm in a shoulder holster"
     part of:  #surveying_instrument__surveyinginstrument__surveyor's_instrument  an instrument used by surveyors

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