MULTILAYER TREATMENT - The term “multilayer” means that a coating composed of layers of metals evaporated under vacuum with alternating high and low refraction indexes such as titanium oxide and magnesium fluoride is applied to the outer surface of the lens. These materials with different refraction indexes deviate the ray of light inside the layers continuously. A multi-layer coating works with the base lens (colored) in reducing the quantity of light that reaches the eye while simultaneously offering the possibility to calibrate/balance colors and therefore improve vision under any weather conditions at all.