On Sat, 09 Dec 2017 19:41:16 -0600, Tim McNamara
wrote:

On Sat, 9 Dec 2017 10:34:13 +0100, Sepp Ruf
wrote:

Because you generally want to shield from a flattish \ line of
approaching lights, but not shield your view to the sides, the flatter
brims work better.

We're talking about cycling caps, not baseball caps. A cycling cap
bill's curve would shade the center of the field of view while allowing
peripheral vision.

Just like the curved cutoff in the awful OculuStvzo engineering sample
doesn't work...

There's no equivalence between the shape of the brim and the shape of
the cutoff. The cutoff is designed to manage outgoing light, keeping it
where it is useful and not shining it where it is not.

black-tinted rear window; auto-dimming mirrors; manure-spreading trailer.

I have an auto-dimming mirror in my new car. It verges on useless as it
does not dim anywhere near enough. I'd rather have a manual mirror so
that I don't have to reach up and point the damned mirror at the ceiling
so that I'm not blinded by the vehicle behind me.

My wife's small Honda has a manual tab on the bottom of the mirror.
Flick it with your finger and the "guy behind"'s lights are focused on
the ceiling :-)

--
Cheers,

John B.