#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

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