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Has analyzed the ideal standard of sunglasses

by:Eugenia     2020-08-19
Ideally qualified sunglasses standards to meet the following conditions: 1. Uv transmittance UVA '5%, UVB' 1%; 2. Filter out 75% ~ 90% of the sun; 3. Have accurate optical performance, through the lens see things not twisted; 4. Around the lens color uniform degree, color difference is not greater than 5%; 5. The lens impact resistance is strong, not easy and broken; 6. Picture frame wear comfortable;
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