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A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state.
Motorcycle goggles or glasses help protect the eyes from dust, wind and debris while riding and typically feature anti-fog treatment and protection against UV rays. For motorcycle sports such as motocross , goggles typically feature a foam rim which seals against the face and layered, tinted lenses to accommodate for varying light conditions.
Varilux. Varilux is a brand name belonging to Essilor International, a producer of corrective lenses. The first version of the lens was invented by Bernard Maitenaz and released in 1959, and was the first modern progressive lens to correct presbyopia. The progressive lens is characterized by correcting near, intermediate and far vision.
In 2009, it launched the first commercially viable photochromic shield for motorcycle helmets. In 2010, it introduced Transitions XTRActive lenses, with technology that allows the lenses to activate behind the windshield. In April 2014, Essilor acquired the entire stake of PPG in Transitions.
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 ...
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 ...
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