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Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [ 2]
Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has to change their eye position ...
Prism (optics) A familiar dispersive prism. 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 ...
Wedge prism. The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from ...
Prism Power 1970s From the unreleased concept album envisioned by John Hall, "The Invincible Yang". Early version of Crime Wave with other inspiration from Al Harlow's solo song, Hip Shakin'. Spaceship Superstar (Demo) 1977 Jim Vallance: From the Prism sessions. Early version of the released song. Stay 1979 John Hall From the Armageddon sessions.
Deluxe Reading dolls were sold in the 1950s–1970s through supermarkets and are often referred to as Grocery Store Dolls. They were an inexpensive alternative to department store dolls, although of similar quality. Another successful toy for girls was the "Dream Kitchen" (circa 1961) which consisted of four 12-inch-tall colorful kitchen ...
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