Polaroid sunglasses would be great for anglers, since the water that's the biggest reflecting surface - and the one you're looking at most - is usually fairly flat, even if it's not a big lake. They're also helpful for driving in "flat country."

They might reduce eye strain for pilots in low-flying planes, but the big guys at higher altitudes probably don't benefit a lot and good UV blocking lenses would be more help.

The early photochromic lenses generally darkened fairly quickly, but when you got out of the sun some of them were incredibly slow at lightening, so you might walk into the first wall past the door when you pull into a rest stop on the highway. Newer ones seem to be better(?). I've never seen trustworthy specifications on any photochromics that say whether they block all frequencies or (like early polaroids) just the visible part, so it's uncertain how much "protection" they provide for the eyes or whether they just make you "feel better about it."

Lots of the "most advertised" sunshades appear to be just "colored glass" (or usually more like dirty plastic).

John