Dry eye is a common and frequently chronic condition, especially among elderly persons. With each blink of the eyelids, tears flow across the cornea, the front surface of the eye.
Tears offer lubrication, lower the risk of eye infection, remove foreign matter from the eye, and maintain the smooth, clear surface of the eyes.
Excess tears in the eyes drain into the back of the nose through tiny drainage ducts in the inner corners of the eyelids.
Inadequate tear production and drainage can lead to dry eyes.