2 Types of Dry Eye Disease
Evaporative Dry Eye
The tear film is made up of 3 distinct layers:
- The mucus layer keeps the tear in contact with the eye
- The water layer keeps the eye hydrated
- The oil layer keeps the water from evaporating.
If any of the 3 layers are unstable, you may have evaporative dry eye.
Meibomian Gland Dysfunction
If your dry eye disease is evaporative, you may also have meibomian gland dysfunction (MGD). The meibomian glands are tiny glands along the edges of the eyelids responsible for producing oil. This oil is a critical component of your tear film and keeps your tears from evaporating too quickly.
When the glands are blocked, they can’t secrete oil, meaning your tears might dry up before they can fully moisturize the eye.