Changing outdoor light conditions doesn't require changing eyewear anymore. SmartLens protective eyewear lightens and darkens with rise and fall of outdoor light conditions. Transitions from light to dark in less than 20 seconds (allowing just 22% light transmission), dark to light in less than 3 minutes (allowing 77.5% light transmission)<br><br>
<ul>
<li>Photochromic lenses darken and lighten as the outdoor light changes</li>
<li>Spring-adjusted temples allow for a flexible fit on narrow or wide faces</li>
<li>Strong frame with magnesium alloy temples provides durability</li>
<li>Soft, adjustable nose bridge and nylon brow enhance comfort</li>
<li>Polycarbonate lenses absorb 99.9% UVA and B</li>
</ul>