Because our tear ducts grow less productive with age, individuals aged 65 years and older are more likely to develop “dry eye syndrome.” Other symptoms of dry eye include itching, stinging, and burning sensations. Causes range from medications that inhibit tear production as a side effect to diabetes, arthritis, and long-term use of contact lenses. Whatever the cause, it is important to treat dry eye since keeping the eyes moist is essential to eye health and good vision. Blinking the eyelids spreads fluid from the tear glands over the eyes, after which it is drained away through the tear ducts. This moist condition keeps the outer layer of the eye free from debris and the cornea clear for optimum vision.
P.S. Tears protect the eyes against infection.