Brown: it can filter out a lot of blue light, improve visual contrast and clarity, and wear well when air pollution is serious (such as sandstorm) or foggy.
Green: Like gray, it belongs to neutral color system, because it can increase the green light reaching the eyes, so it is cool and comfortable, suitable for people with tired eyes.
Blue-gray: Like gray, it belongs to neutral color system, with dark color and high absorption rate of visible light.
Mercury lens: High-density coating on the lens surface. It can absorb and reflect more visible light and is suitable for outdoor sports people.
Yellow: Strictly speaking, this kind of lens does not belong to sunglasses, because it can hardly reduce visible light, but can improve contrast and provide more accurate visual images, so it is also called "night vision goggles". Of course, it can also be used for decoration at night.
Light colors such as light blue and light pink: decorative is more than practical.