Photochromic lenses were a breakthrough technology, allowing one pair of sunglasses to perform well under various lighting conditions, slowly darkening as the sun comes out, lightening in the shade of the forest, perfect for a hike through the countryside. But photochromic lenses are not the right choice for high performance cycling. Their reaction to changes in lighting is way too slow. Cycling requires an immediate response to lighting changes. Riding in full sunlight, entering a short, dark tunnel, then shooting out into full sun again — no photochromic lens can change fast enough to keep up. You’re forced to remove your eye protection, look over or under it, or just pray there’s nothing in your way when you enter that tunnel. Is there any eye protection in the world that can keep you safe in this situation? Yes! Zegho, with Tunnel View lens technology. Invented by the ASSOS Werksmannschaft (patent pending) and custom made for Zegho by Carl Zeiss Vision Sunlens, Zegho TV is unique. Dark tinted through the upper two-thirds of the lens and clear across the bottom third, with a sharp transition between the two zones, Zegho TV gives you crystal clear vision with just a slight lift of your head and, just as important, still gives you 100% protection from UV rays, wind, dust and debris. Wow!