photochromic


Also found in: Encyclopedia, Wikipedia.

photochromic

(ˌfəʊtəʊˈkrəʊmɪk)
adj
(General Physics) (of glass) changing colour with the intensity of incident light, used, for example, in sunglasses that darken as the sunlight becomes brighter
References in periodicals archive ?
Anyone who can get on the Internet can get samples of photochromic pigmentation, and pretty much get to where you need to be to counterfeit it, depending on their level of expertise," he continued.
ESSILOR INTERNATIONAL has announced that it has acquired photochromic lens provider Transitions Optical.
Coatings and speciality products company PPG Industries Inc (NYSE:PPG) announced today the signing of an agreement to divest its 51% interest in Transitions Optical, a supplier of photochromic lenses and a consolidated subsidiary of PPG, to ophthalmic optics company Essilor International, which currently holds a 49% interest in the joint venture.
PPG holds a 51% stake in Transitions Optical, which provides photochromic lenses to optical manufacturers, reporting it as part of its Optical and Specialty Materials segment.
Lens product manager at Rodenstock UK, Debbie Bathgate, said the lenses are aimed at all active sunglass wearers and for all kinds of summer and winter sports, including drivers, bikers, climbers and water sports, when users benefit from permanent high contrast combined with photochromic properties.
However, it must be remembered that the figures quoted indicate the physical number of individual lens entries in the publication and one lens design can feature many times in the Availability Index if all the different refractive indices and treatments, such as photochromic and polarised versions, are taken into account.
By eliminating extra product shipments for manufacturing, VEL saved more than 12,500 gallons of gas in 2006 by producing its proprietary, award winning LifeRx[TM] photochromic lenses in one facility.
SIGNET ARMORLITE has expanded its photochromic range to now include the new Kodak Transitions XTRActive lenses.
Specialty chemical companies have developed pigments that produce special effects such as: interference/color shifting, luminescent/phosphorescent, fluorescent, metal effect, light sensitive photochromic, and color changing thermochromic.
Hoya has released a new photochromic lens, Suntech Intense which is available in a wide choice of Hoya lens materials across the iD FreeForm, TrueForm, conventional and single vision lens designs.
coatings research and development center and advanced through a series of product and commercial development assignments before being appointed program manager for photochromic lenses in 1989.
Zeiss PhotoFusion darken lenses are up to 20% faster than the company's existing photochromic lenses and fade back up to two times faster.