There'snosuchthingasanaveragedayforyoureyes.Lightchangescontinuallyfromsunuptosundown.Nomatterwhattheweathermaybe、youreyesareconstantlyexposedtolightingconditionsthatstrainandfatigue.TheSerengetiDriverslensisdesignedspecificallydesignedfordrivingorflying.Thedriverslensisaphotochromic、単一gradientlens、darkeratthetoptoblockthesun'sglarewhilelighteratthebottomtoprovideaclearviewofinstrumentpanel.ThedriverisalsoNOTpolarized.Polarizedlensescanmakeitharder（evenimpossible）toreadLCDscreenbasedinstrumentsandofteninterferewiththeviewthroughpolycarbonateorsafetyglasswindshieldssuchasthosefoundinaircraft ....