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DIN EN ISO 21987:2017
Ophthalmic optics - Mounted spectacle lenses (ISO 21987:2017); German version EN ISO 21987:2017
Establish requirements for finished, mounted prescription eyewear for refractive power, prismatic power, prism imbalance and prism reference point placement and mechanical tolerances of segment/fitting cross placement.
Deutsches Institut für Normung [din]