INFORMATION FROM CUSTOMER SERVICE RAY-BAN
B-15 - brown lens, and G-15 - a gray-green lens. Both lenses allow to pass only 15% of visible daylight. It also blocks the UVB ultraviolet and infrared rays (UV red).
In 1951, in response to the US military, Bausch & Lomb began to develop a truly neutral lens for sunglasses called N-15. This lens was slightly redesigned to make it more suitable for use in lightweight rims and renamed G-15. The military were impressed with the first test and immediately ordered a full range of glasses with lenses G-15.
HOW DOES THE LENS
Human eyes are not equally recognize all the colors in the visual spectrum. They are more sensitive to green and yellow wavelengths and less sensitive to red and blue. Based on this knowledge, the lenses were made so as to emphasize the colors that our eyes see most easily and downplay the role of the less useful colors.
G-15 lens absorbs 85% of visible light, passing only 15%. Curve light transmission G-15 (the amount of light that is allowed to pass through the lens) is similar to the color sensitivity of the human eye. This means that the lens transmits the color spectrum, the most susceptible to the eye. Which leads to the natural vision to the eye - the true colors that are calm and pleasant.
G-15 lens is made of resistant to external influences the optical quality of glass. It provides 100% UV protection glass is resistant to scratches, and has an outstanding long-term stability. That is, over time, the spectacle lens does not change their color or hue.