@clive @dalias My car's not expensive enough to have them available unfortunately, so I'm going to try this instead. https://www.nhtsa.gov/sites/nhtsa.gov/files/blindzoneglaremirrormethod.pdf
Oncoming headlights are still the biggest issue though. I want glasses made out of some Clarke-tech metamaterial that doesn't dim most things but "takes the edge off" bright point sources.