#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
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