... yeah, this discussion is endless ...
HOWEVER:
I can't believe there's still pilots around who see advantages of changing or gradient lenses.
For an aviator there is not always earth where is the lower part of the sunglasses. Even if you don't do aerobatics, you do turns, and your eyes will be less protected on the "upper" side of the turn.
Also in quick changing brightness, which happens in the cockpit all the time, changing lenses are nonsense.
UV-C is the radiation with less than 400 nm (also called blue light) and is suspected to be reason for damages on eyes when you get old. Swiss National Healthcare Institute SUVA came to this conclusion (and invented the Suvasol lenses). It's also wrong to think that UV-C only occures in polar regions. Everyone knows that it's a question of dosis, and in the air on high FLs there is considerably more UV rays than on ground. Latest stratospherical research come to the conclusion that "ozone holes" not only happen in polar winters but everywhere on the planet.
There is another factor to be considered: The form is not only fashionable and a comfort question. Straight models (conventional pilot glasses' frame) let more rays entering your eye from the side and from the back. A "round" model ("wrap around") is not only "cool", but absolutly necessary from a medical point of view. Mountain climber knew that already before those wrap around models existed.
If you consider all these points you come to the conclusion that Oakley is the only way to go, if you like it or not. Or if you don't want a famous brand go for Suvasol or any other brown glass with UVC filter capability.
Bear in mind that until now Oakley is the only provider who has solved the problem of corrected RX prescribed wrap around lenses. It needs very complicated production steps to do so. Other lenses sometimes show abberations when you move your head, very disturbing!
Dani