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lens grinding blocking system germany

Jul 05, 2019 Essilor Xperio Tinted lenses blocked 100% ultraviolet and 99.9 to 73.1% high-energy violet light between 400 and 426 nm, similar to the promotional sunglasses. However, the Essilor Xperio lens did not block 100% ultraviolet light but blocked only 90.7 to …

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