It is clin¬i¬cal¬ly proven to increase the thick¬ness of the tear film which relieves symp¬toms of Dry Eye1. 0.15% Hyaluron¬ic acid acts as a tear lubri¬cant, pro¬vides long-last¬ing relief and soothes your symptoms and 3% Tre¬halose is added to pro¬vide pro¬tec¬tion for the sur¬face of the eye.