中文The mystery of photochromic glasses
In outdoor activities, everything in the day will be bathed in the sun, which for a long time in the outdoor friends, not only because of harsh and feel uncomfortable, more hinder the appreciation of beautiful natural scenery, even affect the safety. So, many people wear "color changing" glasses to protect their eyes from bright light. A suitable color-changing glasses can not only help you protect your eyes from the harsh sun, protect your eyes from ultraviolet rays (reduce...
