Does anyone know....?

[MissMillie]

I know that you can get eye glasses that turn into sunglasses when you go out in the sun.

One would think that this would be perfect for automobiles.

(I say this because I drive East in the a.m. and West in the p.m. and I notice that hardly anyone wears sunglasses and there's always a line of cars w/ their brake lights on whenever we come around a corner (or over a hill) into solar glare.)

Are such windshields available?

[-..__...]

1. I don't know if they're commercially available.

I remember reading about someone who invented a windshield that did something like that. IIRC, it worked on an entirely different principle
than photochromatic eyeglasses.

The windshield I read about darkened when a certain amount of voltage was introduced to it.