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ČSN EN 16128 ed. 2 This European Standard specifies the reference method for the testing of spectacle frames, ready-to-wear spectacles, sunglasses and other items for eye and face protection for nickel release. The reference method supports the demonstration of conformity with the limit value for nickel release of 0,5 µg/cm2/week set forth by European Regulation. The reference method involves the procedural steps shown in Figure 1 and described in Clause 4. This document applies to those parts of metal spectacle frames and those metal parts of combination spectacle frames that are intended to come into direct and prolonged contact with the skin of the wearer. This document also applies to those relevant metal parts of ready-to-wear spectacles, sunglasses and other items for eye and face protection. NOTE: The reference method for articles apart from spectacle frames, ready-to-wear spectacles, sunglasses and other items for eye and face protection is specified in EN 1811.