Gotta love that little flippy switch on your rear-view mirror.
I've often wondered how it works, and finally my lifelong quest comes to an end.
Really simple, really effective. One flick, and sight is restored.
Elmer Berger has been credited with inventing the rear-view mirror - without the day-night switch. I have no idea who came up with the day-night switch, but that guy can have a free beer on me anytime.