Gray or Brown Sunglasses?
Opinions vary on this topic, and even half of what is known is wrong. Based on my 20-year-experience, the following is the conclusion:
First of all, grey or tawny has nothing to do with UV protection, because it depends on the material of the lens (resin is better than glass, but even glass can block most UV rays, which is why color-changing glasses cannot change color in the car because there is not enough UV). The advantage of gray (or black) lenses is that nothing changes when you look at it, everything just gets darker, and it feels cooler, which is better for intense sunlight. And for the tawny lens because it contains more yellow, actually has the function of brightening, so the tawny lens has the function of blocking the sun, and the clarity of things is higher, but everything seems to be getting warmer, so the tawny lens is more suitable for rainy weather or when the sun is not strong, and suitable for wearing in winter. Many articles mention that the brown color can block blue light, which I do not have the knowledge of scientists, but personally believe that the blocking blue light has nothing to do with the color and material of the lens. If you need to block blue light, the best solution is to order plain light or prescription lenses with an anti-blue light coating, which can block most blue light (note that natural blue light is more intense in rainy weather).
First of all, grey or tawny has nothing to do with UV protection, because it depends on the material of the lens (resin is better than glass, but even glass can block most UV rays, which is why color-changing glasses cannot change color in the car because there is not enough UV). The advantage of gray (or black) lenses is that nothing changes when you look at it, everything just gets darker, and it feels cooler, which is better for intense sunlight. And for the tawny lens because it contains more yellow, actually has the function of brightening, so the tawny lens has the function of blocking the sun, and the clarity of things is higher, but everything seems to be getting warmer, so the tawny lens is more suitable for rainy weather or when the sun is not strong, and suitable for wearing in winter. Many articles mention that the brown color can block blue light, which I do not have the knowledge of scientists, but personally believe that the blocking blue light has nothing to do with the color and material of the lens. If you need to block blue light, the best solution is to order plain light or prescription lenses with an anti-blue light coating, which can block most blue light (note that natural blue light is more intense in rainy weather).