types:

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binoculars, field glasses, opera glasses

an optical instrument designed for simultaneous use by both eyes

esophagoscope, oesophagoscope

an optical instrument for examining the inside of the esophagus

jeweler's glass

an optical instrument used by jewelers; has one or more lenses and is used to view features not readily seen

periscope

an optical instrument that provides a view of an otherwise obstructed field

projector

an optical instrument that projects an enlarged image onto a screen

sights

an optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument

eyeglasses, glasses, specs, spectacles

optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision

prism spectroscope, spectroscope

an optical instrument for spectrographic analysis

bifocals

eyeglasses having two focal lengths, one for near vision and the other for far vision

bombsight

a sighting device in an aircraft for aiming bombs

epidiascope

an optical projector that gives images of both transparent and opaque objects

front projector

a projector for digital input

goggles

tight-fitting spectacles worn to protect the eyes

gun-sight, gunsight

a sight used for aiming a gun

lorgnette

eyeglasses that are held to the eyes with a long handle

mass spectrometer, spectrometer

spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer

cine projector, film projector, movie projector

projects successive frames from a reel of film to create moving pictures

overhead projector

a projector operated by a speaker; projects the image over the speaker's head

pince-nez

spectacles clipped to the nose by a spring

slide projector

projector that projects an enlarged image of a slide onto a screen

spectrograph

a spectroscope by which spectra can be photographed

dark glasses, shades, sunglasses

spectacles that are darkened or polarized to protect the eyes from the glare of the sun

type of:

instrument

a device that requires skill for proper use