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Belay glasses are eyeglasses with prismatic lenses that are used by belayers in rock climbing to avoid the neck strain associated with belaying.
Prism and Base Prism refers to a displacement of the image through the lens, often used to treat strabismus and other binocular vision disorders. The prism value is measured in prism diopters , and Base refers to the direction of displacement.
An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.
The company sells glasses and sunglasses on the Internet only. It sells 2,300 frames and supports progressive lens and bifocals but does not support contact lens. It is able to keep costs down compared to glasses specialty stores by offering brands they have created instead of name brands.
Around 1286, possibly in Pisa, Italy, the first pair of eyeglasses was made, although it is unclear who the inventor was. The earliest known working telescopes were the refracting telescopes that appeared in the Netherlands in 1608.
Some optical glasses use up to twenty different chemical components to obtain the desired optical properties. In addition to optical and mechanical parameters, optical glasses are characterized by their purity and quality, which are essential for their use in precision instruments.