- Aqueous Deficient Dry Eye: This occurs when the lacrimal glands do not produce enough watery tears. Common causes include aging, hormonal changes, autoimmune diseases, or certain medications.
- Evaporative Dry Eye: Caused by insufficient production of the oily component of tears from the Meibomian glands, which leads to rapid tear evaporation. This type is often associated with eyelid disorders, environmental factors, or prolonged contact lens use.