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The tint of a sunglasses lens determines which parts of the mid-spectrum light the lens absorbs. Manufacturers use different colors to produce specific usage effects. 1. Gray is a good general-purpose color, with minimal color distortion while reducing brightness. Grey lenses provide glare protection, making it ideal for driving and general use. 2. Yellow or gold lenses reduce blue light while allowing more light of other frequencies to pass through the lenses. Because blue light bounces and scatters a lot of light, it can create a glare effect called blue haze. In fact, yellow eliminates the blue part of the spectrum, making everything appear bright and clear. This is also the reason why snow blindness sunglasses are generally yellow. These shades can distort color perception a bit, so sunglasses in these shades are not suitable for activities that require accurate color identification. 3. Amber and brown are also good general-purpose colors. They reduce the glare effect, and their unique molecules can absorb higher frequency colors, such as blue, in addition to UV light. Studies have shown that long-term exposure to near-ultraviolet light (such as blue and violet) is one of the causative factors of cataracts. These sunglasses cause the same color distortion as yellow lenses, but increase contrast and clarity. 4. The green lens can filter out some blue light and reduce the glare effect. Of all the color lenses, green lenses provide the highest contrast and the greatest visual acuity, so they are very popular. 5. Purple and rose lenses provide the best object contrast against a green or blue background. Therefore they are a good choice for hunting and water skiing.