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Photochromism. A photochromic eyeglass lens, after exposure to sunlight while part of the lens remained covered by paper. Photochromism is the reversible change of color upon exposure to light. It is a transformation of a chemical species ( photoswitch) between two forms by the absorption of electromagnetic radiation ( photoisomerization ...
You can leave one on your desk, drawer, purse, and car console (or just have back-ups if you’re always losing or misplacing your glasses!). These glasses boast an impressive range of ...
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.
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 ...
1849–1972: Essel and Silor. Essel ( S ociété des L unetteries) was founded in 1849 (then-called L'Association Fraternelle des Ouvriers Lunetteries) as a small network of eyeglass assembly workshops in Paris. It expanded in the late 19th and early 20th centuries by acquiring factories in nearby Parisian neighborhoods and Eastern France.
Corrective lens. 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. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
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