Sunglass Structure

Dyed lenses
The color of sunglasses lenses determines which parts of the spectrum they can absorb. Manufacturers use different colors to produce specific usage effects
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1. Gray is a great universal color that minimizes color distortion while reducing brightness. Gray lenses can provide glare protection, making it an ideal choice for driving and general use.
2. Yellow or gold lenses can reduce blue light while allowing more light of other frequencies to pass through the lenses. Because blue light can bounce and scatter a lot of light, it can produce a glare effect called blue haze. In fact, yellow can eliminate the blue part of the spectrum, making all objects appear bright and clear. This is also why anti snow blind sunglasses are generally yellow. These types of colors can cause some distortion in color perception, so sunglasses with these colors are not suitable for activities that require accurate color recognition.
3. Amber and brown are also good universal colors. They can reduce glare effects, and in addition to ultraviolet rays, their unique molecules can also absorb colors at higher frequencies, such as blue. Studies have shown that long-term exposure to near-ultraviolet light (such as blue and purple) is one of the pathogenic factors for cataracts. These types of sunglasses, like yellow lenses, can cause color distortion but increase contrast and clarity.
4. Green lenses can filter out some blue light and reduce glare effects. Among all colored lenses, green lenses provide the highest contrast and maximum visual acuity, making them highly popular.
5. Purple and rose colored lenses provide the best object contrast against a green or blue background. Therefore, they are good choices for hunting and water skiing.
Many sunglasses manufacturers use a process called constant density to dye the lenses. This is the oldest sunglasses manufacturing process, where the entire glass or polycarbonate mixture material has the same color. Therefore, in the process of manufacturing lenses, the color is inside the lens. Plating a layer of light absorbing molecules onto the surface of pure polycarbonate is also a dyeing method. The most commonly used method for dyeing polycarbonate lenses is to soak the lenses in a special liquid containing a dye, so that the dye is slowly absorbed by the plastic. If you want to make the color darker, simply extend the time the lens is immersed in the liquid.