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In the absence of activating light, the lenses return to their clear state. Photochromic lenses may be made of polycarbonate, or another plastic. Glass lenses use visible light to darken. They are principally used in glasses that are dark in bright sunlight, but clear, or more rarely, lightly tinted in low ambient light conditions. They darken ...
Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.
Glass lenses have the best optical clarity and scratch resistance, but are heavier than plastic lenses. They can also shatter or break on impact. Plastic lenses are lighter and shatter-resistant, but are more prone to scratching. Polycarbonate plastic lenses are the lightest, and are also almost shatterproof, making them good for impact protection.
Specialized glasses may be used for viewing specific visual information, for example, 3D glasses for 3D films (stereoscopy). Sometimes glasses are worn purely for fashion or aesthetic purposes. Even with glasses used for vision correction, a wide range of fashions are available, using plastic, metal, wire, and other materials for frames.
Cubitts, established in 2012, is an eyeglass manufacturer based in Kings Cross, London, England.The company creates handcrafted frames, and sunglasses, constructed with custom pins that secure the acetate based on a rivet designed by Lewis Cubitt, one of the three Cubitt brothers who inspired the brand name.
Rimways fare much better with CR-39 because the arches absorb shock and stress. The implementation of polycarbonate—the material used to make bullet proof glass—in addition to making rimless glasses even lighter, reduces the glasses' fragility as polycarbonate can endure a great amount of stress and is highly impact resistant.