This video compares Non Polarized to Polarized Sunglasses in a modern aviation cockpit. The negative effects of polarized sunglasses are "eye-opening".
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A Review of the Serengeti Velocity Sunglasses by Flight Sunglasses.com. Serengeti Model 6935, Espresso, Titanium, Non Polarized Drivers Gradient Lenses. Excellent Aviator Sunglasses That are Popular with Professional Airline Pilots. All Serengeti Lenses are Photochromic or Light-Adjusting lenses.