Gradient lens tints for sunglasses are popular for both fashion and function. The top part of the lens is darker, and gradually grows lighter towards the bottom of the lens. The darkest part of the lens protects you from the sun overhead as you look up. This makes them the perfect companion in the car, since you can see the dashboard clearly through the lighter part of the lens. Also perfect to have lunch on a terrace, or to read in the park. Aesthetically, they provide you with a sophisticated, fashionable look.