Evaporative dry eyes, caused by an unstable or deficient lipid layer of the tear film (the top outer most layer) that affects almost 90% of dry eye patients. 
Hycosan Shield replaces the function of the lipid layer, forming an outer shield over the surface of the tear film, reducing evaporation of the watery layer.
Spreads easily due to low surface tension properties
Replaces the outer lipid layer of the tear film
Helps to indirectly re-establish the tear film's watery layer by preventing its evaporation
Increases tear film thickness, as well as lipid layer thickness, over time
Preservative & phosphate free