Wiley X LA Lenses literally adjust to the light conditions so you don't have to. In bright conditions, they're dark. As the sky darkens, the lenses lighten.
Optical clarity remains perfect no matter what kind of light the day brings. And, Since Wiley X uses shatterproof polycarbonate, the lenses are far safer than old Photochromics (glass that could shatter on impact).
All in all, these lenses are state-of-the-visual arts.