G15 lenses, also known as aviator green. The G15 colour was originally produced for aviators to help see things against blue (sky) backgrounds. They deliver strong vision performance by providing high image contrast. They are a blend of black, green and brown undertones. These attributes make it one of the top selling general purpose lenses and are commonly found in Ray-Ban sunglasses. They perform best best in mid to bright conditions.
Also known in the industry as crystal green or just green lenses.