binocular

binocularpair of binoculars

bin·oc·u·lar

B0258500 (bə-nŏk′yə-lər, bī-)adj.1. Relating to, used by, or involving both eyes at the same time: binocular vision.2. Having two eyes arranged to produce stereoscopic vision.n. often binoculars An optical device, such as a pair of field glasses or opera glasses, designed for simultaneous use by both eyes and consisting of two small telescopes joined together.

bin·oc′u·lar′i·ty (-lăr′ĭ-tē) n.bin·oc′u·lar·ly adv.

binocular

(bɪˈnɒkjʊlə; baɪ-) adjinvolving, relating to, seeing with or intended for both eyes: binocular vision. [C18: from bi-¹ + Latin oculus eye]

bin•oc•u•lar

(bəˈnɒk yə lər, baɪ-)

n. 1. Usu., binoculars. an optical instrument for use with both eyes, consisting of two small telescopes fitted together side by side, each having two prisms between the eyepiece and objective for righting the image. adj. 2. involving both eyes. [1705–15] bin•oc`u•lar′i•ty, n. bin•oc′u•lar•ly, adv.

bin·oc·u·lar

(bə-nŏk′yə-lər)Adjective Relating to or involving both eyes at once: binocular vision.Noun An optical device, such as a pair of field glasses, designed for use by both eyes at once and consisting of two small telescopes. Often used in the plural as binoculars.

Thesaurus

Adj.

binocular - relating to both eyes; "binocular vision"

Translations

binocularecon due lenticon due occhi

binocular

binocular,

small optical instrument consisting of two similar telescopestelescope,
traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it. Traditional optical telescopes, which are the subject of this article, also are used to magnify objects on earth and in astronomy; other types of
..... Click the link for more information. mounted on a single frame so that separate images enter each of the viewer's eyes. As with a single telescope, distant objects appear magnified, but the binocular has the additional advantage that it substantially increases the range of depth perception of the viewer because the magnified images are seen with both eyes. The frame of a binocular is usually hinged to permit adjustment of the distance between the telescopes. Focusing can be done by means of a wheel on the central axis between the telescopes; turning the wheel changes the distance from the objective lenses of the telescopes to the eyepieces. Separate focusing of each telescope from the eyepiece may be provided in some types of binocular. The term binocular now usually refers to the prism binocular, in which light entering each telescope through its objective lens is bent first one way and then the other by a pair of prisms before passing through one or more additional lenses in the eyepiece. The prisms aid in reducing the length of the instrument and in enhancing the viewer's depth perception by increasing the distance between the objective lenses. Other types of binocular include the opera glass and the field glass; both use Galilean telescopes, which do not employ prisms and which usually have less magnifying power than the telescopes in prism binoculars. A binocular is often specified by an expression such as "7×35" or "8×50"—the first number indicates how many times the binocular magnifies an object and the second number is the diameter of either objective lens in millimeters. The size of an objective lens is a measure of how much light it can gather for effective viewing.

Bibliography

See J. T. Kozak, Deep-Sky Objects for Binoculars (1988).

binocular

[bī′näk·yə·lər] (biology) Of, pertaining to, or used by both eyes. Of a type of visual perception which provides depth-of-field focus due to angular difference between the two retinal images. (optics) Any optical instrument designed for use with both eyes to give enhanced views of distant objects, whose distinguishing performance feature is the depth perception obtainable.