Everyone experiences dry eyes once in a while. But for some people, dry eye is a chronic condition that is uncomfortable and limiting for daily tasks. There are two different types of dry eye:
- Aqueous Dry Eye: insufficient tear production
- Evaporative Dry Eye: increase in tear evaporation
Evaporative dry eye is the most common form of dry eye, which affects 86% of dry eye patients. Also called Meibomian Gland Dysfunction (MGD), evaporative dry eye is caused by blockage of the meibomian glands of the eyelid. When these glands are blocked, there is a shortage of oil on the tear surface and tears evaporate quickly.
Aqueous dry eye is caused when your eyes simply do not produce enough tears to nourish your eyes.