RE: Polarized Sunglasses
When it comes to my eyes I don't skimp on price. I've always wore Oakleys since before my RC aircraft days. Now I wear Oakley and Nike sunglasses. Believe me the premium you pay for nice higher end sunglasses are will worth it. Most are multifuctinal, they reduce glare, helps contrast for driving, can be used for fishing to see into the water, and yes they are invaluable for RC flying.
Example of High End sunglasses
Oakley
Nike
Bolle'
Ray-Ban
There are other high end sunglasse's, but those have a track record for nice outdoor activities usage.