No! The color of the lens will only affect the visible light received by the human eye (compared to the 1-4 categories mentioned above), but the ultraviolet light is invisible, so there is no necessary connection with the amount of transmission.
In other words, some transparent lenses can block UV rays because of material properties and special processes, while some inferior sunglasses look dark in color but may not block UV rays.
In modern China, "crystal glasses" (also known as stone mirrors) have been popular. This is because people have not mastered the optical glass technology at that time and can only use natural materials to polish them into lenses. Some of the crystal lenses are brown, which can reduce some of the visible light after wearing, so that people have a "cool" feeling; thus, there is a misinformation of "crystal care eyes".
In fact, the crystal has a high transmittance to ultraviolet light and does not protect the eyes; this also means that the "lens" has no color or color, regardless of the ability to block ultraviolet rays.
Not only that, but wearing an overly dark lens in an unsuitable scene can be dangerous.
For example, when driving in summer, the sun is very strong, and many owners choose dark sunglasses to block the sun. However, wearing dark sunglasses is easy to filter out light objects, and the size of the front body is not accurate, which affects the judgment of the distance. In an emergency, dark sunglasses delay the speed of the optic nerve analysis, resulting in slow response and greatly reducing the driver. Sensitivity to the surrounding conditions allows the driver to make a wrong judgment, resulting in a dangerous situation.