A hunter uses a method known as glassing, which involves a great deal of time spent at vantage points and seeing game from a distance using a pair of binoculars or a spotting scope.
When observing distant objects, the user can use both eyes (binocular vision) through the use of binoculars, also known as field glasses, which are two refracting telescopes set side by side and pointed in the same direction. Though sizes range greatly from opera glasses to enormous pedestal-mounted military types, most binoculars are designed to be carried with both hands.
Binoculars, as opposed to a (monocular) telescope, provide viewers with a three-dimensional vision because each eyepiece displays a slightly distinct image to each viewer's eye, and the parallax enables the visual cortex to create a sensation of depth. Galilean optics, or binoculars with a convex objective and a concave eyepiece lens, were the most common kind of optic employed in the early binoculars.
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