At the Nats a few years ago, I was wearing "welders glasses", but they had no UV protection. The sun was where mother nature's law says it should be... directly in your eyes. About 3 maneuvers into the pattern my eyes began to hurt, another maneuver and I was in severe pain. I waved off the flight. This was similar to welders flash. Needless to say, this SCARED THE DEVIL OUT OF ME!
That evening I was in pain just looking across the pool, at the hotel.
I had someone drive me to get a good pair of sunglasses with multi UV protection .
I told the salesman that I MUST try the glasses outside, looking into sun. He was hesitant, but I gave him my wallet, with ID, money, license, credit cards, etc. and he agreed... I was desparate... He agreed as I tried several brands and densities.
I got "Maui Jims". They are dark, with good protection.. and expensive. I felt pain relief as soon as I put them on. This was the best purchase I have ever made!
I have had no problems in the last five years since I have been using the "Maui Jim's"... that makes it a very cheap purchase.
They are available at Eye Glass Hut, and Bass Pro Shops, among others.
Don't mess with your eyes!
Tom Niebuhr
PS: My wife recently purchased a pair of "Maui Jims" and she is equally satisfied.