Lenses of fixed tint are graded based on the optical density of your tint; in the united kingdom sunglasses must be labelled and show the filter category range. Lenses with light transmission a lot less than seventy five% are unsuitable for night driving, and lenses with light-weight transmission below 8% https://marioqokdw.full-design.com/the-definitive-guide-to-sunglasses-with-camera-66495092