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With the photochromic material dispersed in the glass substrate, the degree of darkening depends on the thickness of glass, which poses problems with variable-thickness lenses in prescription glasses. With plastic lenses, the material is typically embedded into the surface layer of the plastic in a uniform thickness of up to 150 μm.
Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; photochromic glasses are clear or lightly tinted in dark or indoor conditions, but turn into sunglasses when they come into contact with ultraviolet light. Most over-the-counter sunglasses do not have corrective power in the lenses; however ...
One of the most famous reversible photochromic applications is color changing lenses for sunglasses.The largest limitation in using photochromic technology is that the materials cannot be made stable enough to withstand thousands of hours of outdoor exposure so long-term outdoor applications are not appropriate at this time.
Glasses can also be made of photochromic glass, whose tint changes according to radiation. Optical glasses are used for other, much more diverse and specialized applications, such as high-energy particle detectors (glasses detecting Cherenkov radiation , scintillation effects, etc.) and nuclear applications, such as on-board optics in systems ...
Serengeti Eyewear is a sunglasses line owned by Bollé Brands. Their main focus is eye protection ; the company researches and develops technology such as photochromic lenses , polarized lenses , spectral control , among others.
Transitions – #1 selling brand of photochromic lenses. Formerly a joint venture between Essilor and PPG. Foster Grant – American brand selling non-prescription reading glasses; acquired from FGX in 2010. Bolon – Chinese ophthalmic frame brand. Molsion; Kodak Lens – Mid-range lens and coating brand, produced under license from Eastman ...
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