Types of Dry Eye
There are 2 subtypes of dry eyes: evaporative dry eye, which causes tears to evaporate too quickly, or aqueous tear deficiency, which causes poor-quality or insufficient tear production. The cause of your symptoms determines the type of dry eyes you may experience.
These issues affect the quality of your tear film, which is responsible for keeping your eyes hydrated, comfortable, and healthy.
Understanding Your Tear Film
Your tear film is made up of 3 distinct layers, each with its own vital role to play in your eye comfort. These layers include:
- The mucous layer is the innermost layer responsible for keeping your tear film adhered to your eyes and spread evenly across the eye’s surface.
- The aqueous layer is the middle layer responsible for keeping your eyes hydrated. Your lacrimal glands produce the water needed for this layer.
- The oil/lipid layer is the outermost layer responsible for sealing in the rest of the tear film, preventing it from evaporating. These oils are produced from your meibomian glands.