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A Fresnel lens ( / ˈfreɪnɛl, - nəl / FRAY-nel, -nəl; / ˈfrɛnɛl, - əl / FREN-el, -əl; or / freɪˈnɛl / fray-NEL[ 1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
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]
The USC Gayle and Edward Roski Eye Institute, part of Keck School of Medicine of USC, is a center for ophthalmic care, research and education located in downtown Los Angeles, California. It has subsidiary clinics in Pasadena, Beverly Hills and Arcadia. [ 1] It was allied with the Doheny Eye Institute from 1975 until 2013, when Doheny allied ...
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Website. fire.lacounty.gov. Los Angeles County Lifeguards is a division of the Los Angeles County Fire Department. The lifeguard operations safeguard 31 miles (50 km) of beach and 72 miles (116 km) of coastline, from San Pedro in the south, to Malibu in the north. [ 2] The Los Angeles County Lifeguards are the largest professional lifeguard ...
Researchers have found a link between semaglutide use and NAION, a rare condition that is the second-leading cause of optic nerve blindness. (Getty Images) (Jacob Wackerhausen via Getty Images)
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