J.P. Lemiere invented the first "binocular telescope" in 1825. A binocular is an instrument that provides a magnified view of far-away objects and consists of two similar telescopes, one for each eye, mounted in a single frame.
Ignatio Porro introduced the first modern "prism binoculars" when he filed a patent in Italy for a prism erecting system in 1854. What today is referred to as a "binocular" is actually a binocular telescope consisting of two small prismatic telescopes joined together.
There are many other references to very early binocular telescopes; however, the optical plans for most of these instruments weren't recorded.
Binoculars are a pair of identical glasses that are mounted and aligned side by side, together. They allow one to use both eyes when viewing distant objects. Most binoculars are held with both hands.
Whether used for hunting, birding or just observing nature, binoculars are an essential tool. However, the high-quality images that one can see are only possible because of the complex prism systems that come with binoculars.
There are two major types of binoculars designed from these prism systems: the porro-prism model and roof-prism model. The first type has been used for more than a century, while its counterpart has been the product of a more recent technological innovation in the field of optics.