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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