About dry eye conditions
A normal tear film is made up of three layers:
- a mucus layer (closest to the eye) helps tears stick to the eye
- a watery layer – keeps the eye oxygenated and hydrated
- an oily layer (on the surface) stops the tears evaporating
If any of these three layers are not perfect, symptoms of dry eye can be caused such as grittiness, stinging, red eye and even excessive tearing/watering.
There are many causes of dry eye, including:
- increasing age,
- some medication,
- air conditioning,
- eyelid disorders such as meibomian gland dysfunction and blepharitis, and
- inflammatory conditions such as arthritis.