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Essilor has about 450 researchers working at its five R&D facilities: one in Ireland dedicated to photochromic lenses and four Innovation and Technologies Centers in Europe (Créteil, France), the United States (Dallas) and Asia (China and Singapore). The facilities develop new products and work to identify and forge the best possible research ...
Transitions Optical is a U.S. -based company known for manufacturing photochromic lenses, which darken on exposure to specific types of light. The company was founded in 1990. [ 1] In 1991, Transitions Optical became the first company to commercialize and manufacture plastic photochromic lenses. [ 2] From inception the company has been a joint ...
Chalcogenide glass. Chalcogenide glass (pronounced hard ch as in chemistry) is a glass containing one or more chalcogens ( sulfur, selenium and tellurium, but excluding oxygen ). Polonium is also a chalcogen but is not used because of its strong radioactivity. Chalcogenide materials behave rather differently from oxides, in particular their ...
However, for the record: the first autofocus lens for a still camera was the Konishiroku Konica Hexanon 38mm f/2.8 [171] built into the Konica C35 AF (1977, Japan) 35mm point-and-shoot; the first autofocus lens for an SLR camera was the unnamed 116mm f/8 [172] built into the Polaroid SX-70 Sonar (1978, USA) instant film SLR; the first ...
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 ...
Progressive lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. They are characterised by a gradient of increasing lens power, added to the wearer's correction for the other refractive errors. The gradient starts at the wearer's distance prescription at the top of the lens and reaches a ...
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