Tears Naturale forte lubricant eye drop. Unique trisorb technology contains 3 ingredients that work together to lock in moisture to bring long-lasting relief to dry eyes. These tears are closest to natural tears, they proved better "wettability" and slow evaporation of the tear film. Many other brands, tears naturale forte does not contain harsh preservaitves. Instead it contains polyquad, recognized by doctors as being one of the most gentle preservatives, even for very sensitive eyes.