Hazel Gradient lenses start darker at the top, but the tint gets gradually lighter towards the bottom of the lens. Commonly found in fashion sunglasses they have a light gold flash mirror on the outside and a discrete anti-reflective coating on the inside. Light brown lenses work well in low light to mid brightness and naturally filter out high frequency light waves.
As a result they have an image sharpening effect. A great lens for every day and an excellent choice for the aesthetic in designer sunglasses.