Spectro PhotochromicWith a large, Zeiss Polycarbonate lens, the KOO Spectro sunglasses promote clarity vision. Coated with Zeiss Anti Reflective Technology, the lens eliminates reflections from the front and back surfaces of the lens meaning your eyes receive the most possible light, improving contrast, definition, and reducing eye strain. The enhanced, single lens frame design boosts peripheral vision. The frame also provides a tailored feel with a soft rubber nose pad,