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Selecting the best lens for welders' eye protection October 9, 2003 By: In the industrial environment, safety glasses are a necessity for jobs that put employees' eyes at risk of exposure to heat, impact, chemicals, or dust. But workers also need protection from nonimpact dangers, such as radiant energy, eye strain, and fatigue. So choosing the appropriate lens or filter plate for your workers' eye protection is just as important in preventing eye injury as is selecting the appropriate style of safety eyewear. The Dangers of Ultraviolet and Infrared Light Radiant energy exposure, also called optical radiation, occurs with work applications that involve intense concentrations of ultraviolet (UV), infrared (IR), and intense visible light. Arc welding and cutting, as well as laser welding, cutting, and brazing, can expose workers to this type of radiation. 1 Exposure to UV and IR rays can damage the eyes and the skin. Sometimes damage occurs without the worker realizing it, because UV and IR radiation cannot be seen.

Exposure to UV light can lead to photokeratitis, a painful experience more commonly known as snow blindness or welder's flash. IR light is fundamentally less damaging, but workers in blast furnace environments should be protected against exposure, which has been associated with chronic damage to the human lens. Workers are at risk of welder's flash injury even when they are not involved directly in the welding process.

While pupillary reflex and shading of the eyes are natural reflexes to guard the eye from exposure, eye protection is still necessary to protect those who may accidentally be exposed to a welding arc. While the type of protection you choose ultimately depends on your employees' work applications, the following is a general guide to the types of lenses and equipment available to protect welders from exposure to optical radiation.

Clear Lenses for Impact Protection Clear polycarbonate lenses meet the American National Standards Institute (ANSI) Z87.1-1989 standard for industrial impact resistance and work best for indoor applications for which protection from splashes, sparks, or flying particles is necessary. Many styles of clear safety glasses are on the market, offering everything from side shields to wraparound lenses to brow guards. Prodigy The Fat Of The Land Rar Files.

Choosing the right style comes down to the hazards of the working environment. For some applications, safety glasses with side shields are necessary to protect against flying particles. For other jobs, goggles might be more practical because they provide a seal around the eyes. Goggles, too, come in different styles for protection from splashes (goggles without vents or with indirect vents) and protection from particles (goggles that feature side vents for airflow). Clear polycarbonate safety glasses, in addition to guarding against particles or splashes, also can block UV radiation up to 385 nanometers. According to Dr.

Felix Barker, director of research at the Pennsylvania College of Optometry, this blocking ability makes clear safety glasses helpful for guarding nonwelders from indirect exposure to UV rays generated by welding. Side shields also are important if indirect exposure is a possibility. 'It doesn't take much exposure to be affected by UV rays. An unprotected worker could be standing off to the side while others are welding and a few hours later end up with painful eyes,' Barker said. Welding Shades The light given off during most welding processes is as bright as the sun, which makes retinal damage a real issue for welders, according to Barker. Welders are protected from this light by wearing a very dark filter that allows them to look safely at the welding arc, enabling them to produce a quality welded seam. The type of welding application determines the correct shade for eye protection.