If you cannot use polarized lenses, take a look at the Zurich Extreme Glare Sunglasses. Extreme Glare technology supersedes polarized lenses without the annoying blotches on windshields and all avionic digital screens/instruments. Extreme Glare Technology eliminates most sun glare and can be used safely in the cockpit. Extreme Glare blocks more glare from the sun than any other technology! Substantially reduces frowning, squinting, and discomfort from bright sun glare benefiting the Pilot to see approaching aircraft sooner with better clarity. The glasses can be custom made into any quality optical frame with or without a prescription. “Wrap around” frame designs are available. See better, sharper & clearer with better depth perception than most other technologies. Extreme Glare technology does not produce annoying blotches in windshields or in L.C.D. or L.E.D. digital displays. “Extreme Glare” Technology is exclusively available from Zurich International.