What is the American Gray/G-15 Sunglass Lenses Tint?

The U.S. Air Force originally developed the G-15 tint for their pilots' sunglasses. The "G" stands for green, and the "15" refers to the light the lens allows through - in this case, 15%.
The G-15 tint is a unique blend of green and gray. This tint absorbs 85% of visible light and blocks out most of the blue light, resulting in more natural, clearer vision. The G-15 lens protects from bright sunlight and glare, ensuring better color contrast and visual clarity than traditional gray tints.
The unique aspect of G-15 tint is that it transmits colors evenly across the light spectrum, meaning all colors are seen equally, which produces a more realistic view.