What are tears made of?
Tears are very important to us not only to display emotion but when you blink your eyelids spread a film over your eye. This tear film is made up of three layers which include an oily layer, a watery layer, and a mucus layer. Each layer plays a very crucial role in keeping your eye healthy and seeing clearly.
The oily layer is the outer most film of the tear and makes the tear surface smooth and keeps tears from drying up too fast. This layer is produced in the eye’s meibomian glands.
The middle layer which is the watery part of the tear film. It makes up majority of the tear. This layer cleans the eye, washing away particles that irritate the eye and do not belong. This layer is produced from the lacrimal glands in the eyelids.
The inner layer of mucus is the tear film and helps spread the watery layer over the eye, keeping it moist. Mucus is made in the conjunctiva and without this layer, tears would not stick to the eye. This is the clear tissue inside your eyelids and covering the white of your eye.
Causes of Dry Eyes
- Prolonged use of Contact lenses
- Certain diseases, such as rheumatoid arthritis, Sjögren’s syndrome, thyroid disease, and lupus
- Being in smoke, wind or a very dry climate
- Looking at a computer for a long time
- Refractive eye surgery, such as LASIK
- Certain medicines, such as:
- Diuretics for high blood pressure
- Beta-blockers, for heart problems or high blood pressure
- Allergy medicines
- Sleeping medication
- Anxiety medicines
If you start to notice that you are having dry eyes often, contact your doctor to figure out what could be causes this. Take note of the medications you are on and the situation i n which you notice dry irritated eyes.