The lachrymal gland, which lies above the outer edge of each eye, produces tears. These glands constantly secrete a salty fluid, which keeps the eyes moist, and allow the eyeball to rotate properly and whenever we blink, water from these glands is spread over the eye.

Any extra water is collected in two little canals at the inner corner of the eye and carried away to the lachrymal sac near the nose. When stimulated by a pungent smell, or in times of motional stress the tear glands produce more water than usual and there is a flood of tears. Tears have min functions: to keep the eye moist, to act as a mild antiseptic and to drain away dust and small particles from the surface of the eye. The saltiness of the fluid helps to discourage the growth of bacteria and act as an antiseptic.