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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.
According to the current Z87.1-2010 standard, safety glasses must carry the manufacturer's marking, followed by a + sign if the lenses are Impact Rated. For example, if the safety glasses are made by 3M and are Impact Rated, the lenses must be marked 3M+.