The color of the sunglasses lens determines which parts of the spectrum the lens absorbs. Manufacturers use different colors to produce specific effects.
1. Gray is a very good general color, which minimizes color distortion while reducing brightness. Gray lenses provide glare protection, making them ideal for driving and general use.
2. Yellow or gold lenses reduce blue light while allowing more frequencies of light to pass through the lens. Because blue light can bounce and disperse a lot of light, it can produce a glare effect called blue enamel. In fact, yellow eliminates the blue portion of the spectrum, making all objects appear bright and clear. This is why the snow-proof sunglasses are generally yellow. These colors make the color perception a bit distorted, so sunglasses of this color are not suitable for activities that require accurate color recognition.
3, amber and brown are also very good general colors. They reduce glare effects, and in addition to UV, their unique molecules can absorb higher frequency colors, such as blue. Studies have shown that long-term exposure to near-ultraviolet light (such as blue and purple) is one of the causative factors of cataract. In fact, Sun Tiger has a special version called Blue Blockers that holds the patent. These sunglasses, like yellow lenses, cause color distortion but increase contrast and sharpness.
4. The green lens can filter out some of the blue light and reduce the glare effect. Among all color lenses, green lenses offer the highest contrast and maximum sharpness, so they are popular.
5. Purple and rose lenses provide the best object contrast on a green or blue background. Therefore they are a good choice for hunting and water skiing.
Many sunglasses manufacturers use a process called constant density to dye the lens. This is the oldest method of making sunglasses, and the entire glass or polycarbonate blend material has the same color. Thus, in the process of manufacturing the lens, the color is inside the lens. It is also a method of dyeing a layer of light absorbing molecules on the surface of pure polycarbonate. The most common method of dyeing polycarbonate lenses is to soak the lenses in a special liquid containing dyeing substances so that the dyed material is slowly absorbed by the plastic. If you want to make the color darker, just extend the time the lens is soaked in the liquid.