JT lenses pass the American ASTM standard and the European EC Standard, but testing doesnt stop there. JT shoots them, stomps them, hits them with 1/4 inch steel balls at 400 fps, runs over them, and lets the dog chew them. And that proves one thing - JT lenses meet an even higher standard the JT Standard. With a fog-resistant coated thermal inner lens that can be cleaned with a micro fiber cloth.