Dry eye occurs when tears aren't able to provide adequate moisture. Symptoms include stinging or burning, episodes of excess tearing that follow periods of dryness, discharge, pain, and redness in eyes.
Tear film of the eyes
Our tear film is made up of three layers – an oil (lipid) layer, a water (aqueous) layer and a mucin layer. These three layers together help maintain the health of our eyes and prevent infection.
Lacrimal glands are almond-shaped glands, one for each eye, that secrete the aqueous layer of your tear film. They are situated in the upper lateral region of each orbit. In dry eyes syndrome, the lacrimal glands produce less of the lacrimal fluid.
Tear gland tissue
The image illustrates tear gland tissue under the microscope 100x.