<p>a.The UV protection level is the most important factor. The sunglasses we offer&nbsp;can effectively block all harmful UV.<br /> <strong>1.56 Tint lens</strong>: 85-90%&nbsp;UV&nbsp;protection. If you need 100%&nbsp;UV protection, please choose a regular frame and tinted lens with 1.60 lens index or above.<br /> <strong>Mirror lens</strong>:&nbsp; 100%&nbsp;UV&nbsp;protection.<br /> <strong>Polarized lens</strong>:&nbsp;100%&nbsp;UV&nbsp;protection.<br /> <strong>Photochromic&nbsp;lens</strong>:&nbsp;100%&nbsp;UV&nbsp;protection.<br /> <br /> b.Lens color: With darker lens colours,&nbsp;they&nbsp;can block light more effectively. But it does not mean the UV protection level is higher.&nbsp;<br /> <strong>Grey</strong>: No chromatic aberration when the light darkens.&nbsp;<br /> <strong>Brown</strong>: It can filter out blue light, and improve vision comparison and clarity.&nbsp;It is best to use where there is air pollution and foggy weather. &nbsp;<br /> <strong>Green</strong>: The light transmittance of green lenses are low, which reduces your eye strain in sparkle sunlight. It is good to wear for sports but not suitable when you are driving.&nbsp;<br /> <strong>Blue/Purple</strong>:&nbsp;They provide better color perception, and lower reflection from objects, particularly snow. Besides, they function well in foggy days.<br /> <strong>Sunglass with anti-reflective coating</strong>: Improve the quality of imaging and light transmittance and reduce glare. Anti-reflective coating is recommended for all glasses.&nbsp;<br /> <strong>Polarized lens</strong>: Suitable for various outdoor activities.&nbsp;</p>