Polaroid IR Filter: This Filter Will Filter Out Most Light Below And Above The Wavelength Of 720 Nanometers (Infrared)Add a Unique, Creative, Fun Filter To Your Arsenal For Spectacular Artistic Effects This Filter Can Help You To See Perfectly Through Sunglasses And Dark, Tinted Car Windows And Sometomes Even In Total DarknessIR Filters Used In Conjunction With An IR Sensitive Camera Can Sometimes See Things Completely Invisible To The Human Eye.