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Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia , hyperopia , and/or astigmatism . History
Photograph of a triangular prism, dispersing light Lamps as seen through a prism. In optics, a dispersive prism is an optical prism that is used to disperse light, that is, to separate light into its spectral components (the colors of the rainbow). Different wavelengths (colors) of light will be deflected by the prism at different angles. [1]
Using chicken eyeglasses was still practiced in 1973, evidenced by Illinois' The Hawk-Eye newspaper that a farmer had 8,000 chickens fitted with the rose-colored variety. [20] One inventor of a form of the glasses proposed legislation in Kansas to require all chickens in the state to be fitted with glasses, but his campaign was unsuccessful. [21]
Buying Cheap Prescription Eyewear. Cheap glasses are a gamble on size and prescription and don't necessarily match the quality from more knowledgeable outlets or optometrists.
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 the prism.
"The Glasses" is the third episode of the fifth season of the American sitcom Seinfeld. The 67th episode of the series overall, it was written by the writing team Tom Gammill and Max Pross, their debut for the series, and directed by Tom Cherones.
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