Binoculars, field glasses or binocular telescopes are a pair of identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes with binocular vision when viewing distant objects. Most are sized to be held using both hands, although there are much larger types. Small, low-power binoculars for use at performance events are known as opera glasses (see below). Many different abbreviations are used for binoculars, including glasses and bins Unlike a monocular telescope, binoculars give users a three-dimensional image: the two views, presented from slightly different viewpoints to each of the viewer's eyes, produce a merged view with depth perception. There is no need to close or obstruct one eye to avoid confusion, as is usual with monocular telescopes. The use of both eyes also significantly increases the perceived visual acuity, even at distances where depth perception is not apparent (such as when looking at astronomical objects).

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