I got a new pair of glasses last week and I sprung for transition lenses and I'm enjoying them so far. It got me to thinking though why hasn't anybody developed this technology for trucks from the factory or in the form of an aftermarket tinting.
I think that it would be perfect, tinted during the day to protect you from the dangerous UV rays and clear during the night so you can see in the mirrors when your backing up.
Transitions Lenses