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China Blue Cut Optical Lens Price Factories – 1.50 1.49 CR-39 Ophthalmic Lens Anti Blue Light Lens – YOLI Detail:Why to Choose CR-39 Optical Lenses?Crystal Vision (CR) are top quality lenses made by one of the world’s largest lens company.CR-39, or allyl diglycol carbonate (ADC), is a plastic polymer commonly used in the manufacture of eyeglass lenses.The abbreviation stands for “Columbia Resin #39”, which was the 39th formula of a thermosetting plastic developed by the Columbia Resins project in 1940.Owned by PPG, this material is revolutionising lens making.Half as heavy as glass, far less likely to shatter, and optical quality nearly as good as glass.CR-39 is heated and poured into optical quality glass moulds – adapting the qualities of glass very closely.
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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.
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