Photochromic lenses are optical lenses that darken on exposure to specific types of light of sufficient intensity, most commonly ultraviolet (UV) radiation. In the absence of activating light the lenses return to their clear state. Photochromic lenses may be made of glass, polycarbonate, or another plastic. They are principally used in eyeglasses that are dark in bright sunlight, but clear in low ambient light conditions. They darken significantly within about a minute of exposure to bright light, and take somewhat longer to clear. A range of clear and dark transmittances are available; one manufacturer makes one glass with transmittance reducing from 87% to 20%, and another reducing from 45% to 9%.

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  • Le verre photochromique est un verre correcteur qui a la propriété de se teinter en fonction de la quantité d'ultraviolet (UV) à laquelle il est soumis. Quand l'exposition aux UV disparait, les lentilles optiques retrouvent graduellement leur état clair. Les verres photochromiques sont fabriqués soit avec du verre minéral, soit à partir de plastique thermodurcisseur (appelé organique) ou thermoplastique (appelé polycarbonate). (fr)
  • Photochromic lenses are optical lenses that darken on exposure to specific types of light of sufficient intensity, most commonly ultraviolet (UV) radiation. In the absence of activating light the lenses return to their clear state. Photochromic lenses may be made of glass, polycarbonate, or another plastic. They are principally used in eyeglasses that are dark in bright sunlight, but clear in low ambient light conditions. They darken significantly within about a minute of exposure to bright light, and take somewhat longer to clear. A range of clear and dark transmittances are available; one manufacturer makes one glass with transmittance reducing from 87% to 20%, and another reducing from 45% to 9%. In one sort of technology, molecules of silver chloride or another silver halide are embedded in photochromatic lenses. They are transparent to visible light without significant ultraviolet component, which is normal for artificial lighting. In another sort of technology, organic photochromic molecules, when exposed to ultraviolet (UV) rays as in direct sunlight, undergo a chemical process that causes them to change shape and absorb a significant percentage of the visible light, i.e., they darken. These processes are reversible; once the lens is removed from strong sources of UV rays the photochromic compounds return to their transparent state. (en)
  • Le lenti fotocromatiche sono lenti che, esposte a radiazioni UV o luce solare in genere, avviano una reazione chimica reversibile e si scuriscono. Una volta che l'irradiazione di luce o raggi uv scompare ritornano gradualmente allo stato iniziale di trasparenza. Queste lenti proteggono dai raggi UV e dal riverbero solare come gli occhiali da sole, sebbene non possano sostituirli in tutte le situazioni. Le lenti fotocromatiche, quando non esposte a raggi UV, risultano essere molto chiare sebbene non come le lenti trasparenti classiche; la differenza tuttavia è minima e poco percettibile con le lenti delle nuove generazioni, che allo stato chiaro hanno una leggera dominante di colore residuo. (it)
  • As lentes fotocromáticas são lentes que escurecem em exposição a tipos específicos de luz, geralmente radiação ultravioleta (UV). Uma vez que a fonte de luz é removida (por exemplo, ir para dentro de casa), as lentes irão gradualmente retornar ao seu estado claro. As lentes foto-cromáticas podem ser feitas de vidro, policarbonato, ou outro plástico. (pt)
  • Een fotochrome lens is een lens die van kleur verandert als ze wordt blootgesteld aan licht met ultraviolette stralen, zoals zonlicht, en die reversibel terugkeert naar haar oorspronkelijke kleur in het donker of meer algemeen als de straling wegvalt. Fotochrome lenzen worden gebruikt in (zonne)brillen, sport- en skibrillen of als contactlenzen. De eerste fotochrome C werden in de jaren 1960 ontwikkeld. Het effect wordt bekomen door een fotochroom materiaal zoals microkristallijn zilverchloride in het glassubstraat te dispergeren, of door de lens te coaten met een dun laagje van een fotochrome stof. Men kan ook plastic lenzen maken waarin een fotochrome stof is gedispergeerd in het transparante plastic. Dergelijke stoffen zijn bijvoorbeeld spiro(indoline)naftoxazineverbindingen, die snel van kleurloos naar blauw veranderen als ze aan zonlicht of ultraviolet licht worden blootgesteld. (nl)
  • 光致變色鏡片是一種當爆露在某特定波長的光(一般是紫外光)時會變得深色的鏡片,而當不再被此光源照射便會回覆原有的透光率而變得清透。光致變色鏡片可以由玻璃或包括聚碳酸酯在內的塑膠制成。其變色效果是由添加在鏡片內的氯化銀或其他鹵化物,此類物質在沒有被紫外光照射時對可見光是透明的,當被紫外光照射時就會起化學反應,化學反應後變成會吸收部份可見光而令鏡片呈現得深色。此化學反應屬可逆反應,所以當不再被紫外光照射時鏡片就會回覆原有透明的狀態。 (zh)
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  • Le verre photochromique est un verre correcteur qui a la propriété de se teinter en fonction de la quantité d'ultraviolet (UV) à laquelle il est soumis. Quand l'exposition aux UV disparait, les lentilles optiques retrouvent graduellement leur état clair. Les verres photochromiques sont fabriqués soit avec du verre minéral, soit à partir de plastique thermodurcisseur (appelé organique) ou thermoplastique (appelé polycarbonate). (fr)
  • As lentes fotocromáticas são lentes que escurecem em exposição a tipos específicos de luz, geralmente radiação ultravioleta (UV). Uma vez que a fonte de luz é removida (por exemplo, ir para dentro de casa), as lentes irão gradualmente retornar ao seu estado claro. As lentes foto-cromáticas podem ser feitas de vidro, policarbonato, ou outro plástico. (pt)
  • 光致變色鏡片是一種當爆露在某特定波長的光(一般是紫外光)時會變得深色的鏡片,而當不再被此光源照射便會回覆原有的透光率而變得清透。光致變色鏡片可以由玻璃或包括聚碳酸酯在內的塑膠制成。其變色效果是由添加在鏡片內的氯化銀或其他鹵化物,此類物質在沒有被紫外光照射時對可見光是透明的,當被紫外光照射時就會起化學反應,化學反應後變成會吸收部份可見光而令鏡片呈現得深色。此化學反應屬可逆反應,所以當不再被紫外光照射時鏡片就會回覆原有透明的狀態。 (zh)
  • Photochromic lenses are optical lenses that darken on exposure to specific types of light of sufficient intensity, most commonly ultraviolet (UV) radiation. In the absence of activating light the lenses return to their clear state. Photochromic lenses may be made of glass, polycarbonate, or another plastic. They are principally used in eyeglasses that are dark in bright sunlight, but clear in low ambient light conditions. They darken significantly within about a minute of exposure to bright light, and take somewhat longer to clear. A range of clear and dark transmittances are available; one manufacturer makes one glass with transmittance reducing from 87% to 20%, and another reducing from 45% to 9%. (en)
  • Le lenti fotocromatiche sono lenti che, esposte a radiazioni UV o luce solare in genere, avviano una reazione chimica reversibile e si scuriscono. Una volta che l'irradiazione di luce o raggi uv scompare ritornano gradualmente allo stato iniziale di trasparenza. Queste lenti proteggono dai raggi UV e dal riverbero solare come gli occhiali da sole, sebbene non possano sostituirli in tutte le situazioni. (it)
  • Een fotochrome lens is een lens die van kleur verandert als ze wordt blootgesteld aan licht met ultraviolette stralen, zoals zonlicht, en die reversibel terugkeert naar haar oorspronkelijke kleur in het donker of meer algemeen als de straling wegvalt. Fotochrome lenzen worden gebruikt in (zonne)brillen, sport- en skibrillen of als contactlenzen. (nl)
rdfs:label
  • Photochromic lens (en)
  • Verre photochromique (fr)
  • Lente fotocromatica (it)
  • Fotochrome lens (nl)
  • Lente fotocromática (pt)
  • 光致變色鏡片 (zh)
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