FreshLook ColorBlends (2 lenses) – dioptric. Some of the most popular coloured contact lenses on the market, FreshLook Colorblends dioptric lenses from Alcon are comfortable to wear, correct vision, and enhance natural eye colour. The UV filter in contact lenses increases the protection of the cornea from the dangerous ultraviolet radiation. However, lenses do not cover the entire eye or eye area, so the combination of contact lenses that have UV filter and sunglasses is the ideal protection against harmful UV rays.