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A bifocal lens with areas of differing magnification. Bifocals with separate lenses. In this case, the Swedish ethnologist Jan-Öjvind Swahn [sv]. 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.
Maui Jim. Maui Jim is an American sunglasses manufacturer based in Peoria, Illinois. [ 2 ] Founded in Lahaina, Hawaii, in 1980, the company designs, develops, and manufactures a wide variety of sunglasses marketed under the eponymous brand name. As of 2015, it was the third-largest producer of sunglasses in the world.
Corrective lens. A pair of contact lenses, positioned with the concave side facing upward. 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.
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]
Eyeglass prescription. Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.
79000860 [1] Added to NRHP. September 6, 1979. The John C. Proctor Recreation Center was constructed in Peoria, Illinois, United States in 1913. The Classical Revival center was built per the provisions of its founders will, John C. Proctor. [2] It was designed by Hewitt & Emerson.
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