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Binoculars or field glasses are two refracting telescopes installed side by side and pointing in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most binoculars can be held in both hands, although they vary widely in size, from opera glasses to military models mounted on large bases.

Unlike (monocular) telescopes, binoculars provide users with three-dimensional images: each eyepiece presents a slightly different image to each eye of the observer, and parallax makes a deep impression on the visual cortex.

The term "binocular" comes from the Greek words for "two eyes". They are also called field glasses because they are most often used in outdoor activities such as bird watching, nature observation, and hunting. Binoculars are available at a wide range of prices and with different features; their size and weight vary widely depending on their specifications.

Binoculars are commonly used in bird watching, stage performances, sports events, concerts, and the observation of wildlife. They are also popularly used by war veterans and historians to view battlefields and historic sites. Many office workers use them to view documents and computer screens at a distance.