A dry eye happens when you can’t produce enough tears and maintain a sufficient tear layer. Natural tears of the eye are made up with three layers:
Dry eyes can occur if there are not enough tears being produced, particularly in the aqueous layer of the tear film. It can also occur when there isn’t a sufficient oily layer, thus the tears will evaporate more quickly. Dry eye symptoms can also occur from exposure to environmental conditions, as well as medications like antihistamines, oral contraceptives or anti-depressants. It can also result from chemical or thermal burns to the eye. Dry eyes can be linked secondarily with many health or eye related conditions (such as R.A., Lupus, Sjogrens syndrome, Stevens-Johnson syndrome, etc).
Dry eye syndrome is an incurable disease; but it can be managed to a point where the patient is asymptomatic. There are many treatment modalities that can be done for dry eyes.