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