Clear sunglasses with photochromic lenses suitable for road bikes and cycling. They are very useful when riding early in the morning or at night. I also use them myself. I've used them quite a bit, but I can use them without any problems. When exposed to ultraviolet light, they become lightly smoked. They turn a just-right shade of light black. They are also helpful when riding through tunnels. These are very useful clear photochromic sunglasses. Thank you.