What percentage of UV is absorbed by a clear CR-39 lens?

CR-39 is a type of plastic used in many eyeglasses and has specific properties regarding UV light absorption. A clear CR-39 lens typically absorbs about 50% to 55% of UV radiation, particularly UVB rays, which are known to be harmful to the eyes. This means that while it offers some level of protection against UV radiation, it does not block all of it, and additional protective measures, like UV-coated lenses or sunglasses, may be necessary for complete UV protection.

The percentage of UV absorption by clear CR-39 lenses indicates the lens's effectiveness at reducing the amount of harmful ultraviolet light that reaches the eyes, which is crucial for maintaining eye health. The understanding of UV absorption levels is important for both opticians and consumers in making informed choices regarding eyewear.