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The Z87+(plano lens) and Z87-2+(Rx lens) markings on safety glasses and goggles indicate that eyewear is compliant with ANSI Z87.1 High Impact and ANSI/ISEA Z87.1 industrial safety standard for eye protection. Safety eyewear meeting these criteria are used in a variety of industrial and personal applications.
The protective shade numbers refer to the darkness shade of safety glasses or welding shields, the higher the number the darker the glass. ANSI and the American Welding Society (AWS) publish a slightly more detailed chart, in ANSI Z49.1:2005 Safety in Welding, Cutting, and Allied Processes. In both cases, the recommendations offer the rule of thumb to âstart with a shade that is too dark to see the weld zone.