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Joseph Chamberlain wearing a monocle. A monocle is a type of corrective lens used to correct or enhance the visual perception in only one eye. It consists of a circular lens placed in front of the eye and held in place by the eye socket itself. Often, to avoid losing the monocle, a string or wire is connected to the wearer's clothing at one end ...
Galilean type Soviet-made miniature 2.5 × 17.5 monocular Diagram of a monocular using a Schmidt-Pechan prism: 1 – Objective lens 2 – Schmidt-Pechan prism 3 – Eyepiece. A monocular is a compact refracting telescope used to magnify images of distant objects, typically using an optical prism to ensure an erect image, instead of using relay lenses like most telescopic sights.
Historical types include the pince-nez, monocle, lorgnette, and scissors-glasses. Eyeglass lenses are commonly made from plastic, including CR-39 and polycarbonate. These materials reduce the danger of breakage and weigh less than glass lenses.
A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye.
The eyepiece - a monocle designed by Brilliant Labs that is open-sourced so its firmware can be experimented with - features a camera, a microphone and an internal projector screen where words are ...
The invention of scissors-glasses solved the problem of the single-lensed monocle or "quizzing glass", thought to be tiresome to the eye, by providing two lenses on a Y-shaped frame. They usually had a ring in the end of the handle so that they could be worn on a ribbon or gold chain around the neck.
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