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There are three standards currently used to test the effectiveness of ballistic eyewear. These include a U.S. civilian standard (ANSI Z87.1 – 2010), a U.S. military standard (MIL-PRF-31013), and a European standard (EN 166, 169, 170 and 172). The U.S. civilian standard for protective eyewear was revised in 2010.
These safety sunglasses have a scratch resistant coating, block 99.9% UV, and meet ANSI Z87.1 and CSA Z94.3 standards. The only way to assess the protection of sunglasses is to have the lenses measured, either by the manufacturer or by a properly equipped optician.
Small projectiles and fragments generated from processes like grinding or machining can have the potential to penetrate some types of protective eye-wear. In the United States the ANSI/ISEA Z87.1-2020 standard is used to certify protective eye-wear which is capable of protecting from these hazards.
In a book Battle Rattle (2006 Windrow & Greene) by Hans Halberstadt the author states that the 82nd Airborne Division was the first one to buy Wiley X in bulk, ordering thousands of the SG-1s goggles, originally developed for Ranger regiment, shortly after deploying in Afghanistan in spring 2002.
Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; photochromic glasses are clear or lightly tinted in dark or indoor conditions, but turn into sunglasses when they come into contact with ultraviolet light. Most over-the-counter sunglasses do not have corrective power in the lenses; however ...
Therefore, optical filters on welding helmets must meet ANSI Z87:1 (a safety glasses specification) in order to protect human vision. Some examples of filters that would provide this kind of filtering would be earth elements embedded or coated on glass, but practically speaking it is not possible to do perfect filtering.
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