Gradually tinted lenses are those in which the upper part is darker than the lower part and the transition between shades is smooth.
Polarized lenses are responsible for reducing glare from flat surfaces, e. g. of the water sheet. The reduction of glare makes the image sharper and the colors more saturated.
Lens technology that has the ability to automatically dim under UV light. The lens in the rooms remains clear and at the outside becomes colored accordingly to UV light.