One such problem is the dysfunction of the Meibomian glands. These tiny glands sit inside the edges of the eyelids, where they produce thin oil. This oil travels out to the eye through short ducts. Once on the surface of the eye, the oil works to keep tears from evaporating too quickly. When this system doesn't work right the result is an evaporative dry eye.
Several treatments exist for evaporative dry eyes, such as eye drops or even the intentional blocking of the drainage ducts for tears. However, most people don't like these options; drops are tedious, and blocking tear drainage can be uncomfortable. Fortunately, there is a newer alternative: LipiFlow.