Some Class 2 lenses beat the standard: Avaira, for example, block at least 75% of UV-A radiation and 99% of UV-B radiation, according to the package insert.

WSJ: Contacts Lenses That Let In Sun, But Block UV Rays

Window coatings that block UV rays also give the option of natural light while minimizing its clothing-fading side effects.

WSJ: The $100,000 Closet