Polycarbonate visitor safety glasses are protective eyewear with an untinted polycarbonate unilens with anti-scratch coating and UV400 protection in a large, goggle style size that fits over most prescription glasses, making it suitable for visitors at facilities with potential eye hazards. Untinted lenses can be used indoors and outdoors and don't interfere with color recognition. This protective eyewear's polycarbonate lens resists impact and has an anti-scratch coating to prolong lens life. It protects the wearer's eyes from ultraviolet A (UVA) and ultraviolet B (UVB) light with wavelengths up to 400 nanometers (nm). Indirect vents in the wide temples help protect against splashes and reduce fogging. The polycarbonate wraparound frame provides impact resistance, and the built-in nosepiece provides a comfortable, secure fit. Protective eyewear, such as safety glasses or goggles, is worn to shield eyes from hazards, including flying particles, heat, chemicals, and harmful exposure to light. Face shields and helmets may be also be used with protective eyewear, especially when welding or working with molten materials, to provide additional protection. Eyewear is sometimes designed to wrap around the side of the head to extend protection to the periphery; the extent of this protection is measured as "base lens curve." Base lens curve has a typical range of 6 to 12, with a 6 being on the flat end of the scale and a 12 providing the maximum amount of wrap around the head. Protective eyewear is commonly used in the manufacturing and construction industries, among others.
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