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Safety glasses or spectacles, although often used as a catch-all term for all types of eye protection, specifically revers to protective equipment that closely resembles common eye wear. To meet most national standards, spectacles must include side shields to reduce the ability of debris to get behind the lenses from the side.
Z94.3-15 Eye and Face Protectors Class 6 relates to face shields, and is divided into 3 sub-classes 6A – Impact, piercing, splash, head, and glare protection. 6B – Radiation protection. Also for low heat, splash, glare, and light non-piercing impact protection. 6C – High-heat applications and light non-piercing impact protection only.
Safety glasses provide protection from external debris, and should provide side protection via a wrap-around design or side shields. [ 14 ] Goggles provide better protection than safety glasses, and are effective in preventing eye injury from chemical splashes, impact, dusty environments and welding. [ 14 ]
Workers at Chittagong ship breaking yard, without safety boots and hard hats U.S. police officer with a riot shield. A shield is held in the hand or arm. Its purpose is to intercept attacks, either by stopping projectiles such as arrows or by glancing a blow to the side of the shield-user.
In 2006 Hartley et al. were awarded a US Patent for Eyewear for ballistic and light protection. The invention was not for new protective materials but for a system that would allow the easier interchange of lenses between various types of protective devices, such as glasses, goggles and face shields. [14]
Glasses are worn for eye protection in some sports, such as squash. Glasses wearers may use a strap to prevent the glasses from falling off. Wearers of glasses that are used only part of the time may have the glasses attached to a cord that goes around their neck to prevent the loss and breaking of the glasses.