Dry eye syndrome is a condition where there is insufficient or abnormal production of the tears that keep your eyes moist and comfortable. Symptoms include tired, gritty, or irritated eyes, as well as red, itchy, burning or stinging eyes, sensitivity to bright light, frequent eye rubbing, the appearance of clear or cloudy discharge, and blurred vision when reading or driving. Dry eye syndrome can be caused by a number of factors, including not blinking enough (for example, when staring at a digital device), dry air (for example, in an air-conditioned environment), wearing contact lenses, chemicals, tobacco smoke or dust, eye injury (including burns), eyelid inflammation, certain medications (such as antihistamines, diuretics and some antidepressants), and certain medical conditions (such as diabetes, rheumatoid arthritis, scleroderma, Sjögren's syndrome, thyroid disease, or vitamin A deficiency). The symptoms of dry eye syndrome can be managed through the use of artificial tears and lubricants, lifestyle changes, and, in severe cases, medication.