A viewing instrument is a type of optical instrument that is used to assist viewing or visually examining an object or scenery.
Types
binoculars contact lenses cystoscope electrotachyscope endoscope including oblique-viewing instruments for seeing the digestive system eyeglasses fibrescope finderscope fluoroscope gastroscope gonioscope kinetoscope laryngoscope magnifying glass microscope ophthalmoscope otoscope periscope phenakistoscope also phenakistiscope praxinoscope reflector sight spectroscope spotting scope stereoscope stroboscope tachistoscope telescope teleidoscope viewfinder
References