I got a pair from Polarized Optics. They are bifocal polarized sunglasses but the magnified insert is clear. Look up and it's polarized and tinted, look down and it clear. They work well for flying the Phantom. http://www.polarizedoptics.com/
I got the polarized glasses by exploring the web and got the best fit. Phantom is incredible with these as I have extremely sensitive eyes. I prefer getting glasses from Sunglasses Suppliers on line.
I've been using smith brand sunglasses for years and find that it works well with my screen outdoors. They are polarized and have a "special" coating called chromapop. Link below....