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.
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A Review of the Serengeti Modugno Showcasing Model 8408 - Shiny Dark Gunmetal with Drivers Non Polarized Lenses. Great Deep Lenses, Perfect for Pilot & Drivers.
This video compares Non Polarized to Polarized Sunglasses in a modern aviation cockpit. The negative effects of polarized sunglasses are "eye-opening".