Dry eye syndrome occurs when the eyes don't produce enough tears, or when the tears evaporate too quickly due to a lack of the oils needed for sufficient lubrication. This makes the eyes dry, red, itchy and irritated. DES is often caused by environmental factors, like being exposed to dry wind and air, not blinking enough while looking at a digital device or while reading, and comedogenic makeup — but it can also result from an underlying autoimmune disease.
Left untreated, dry eye syndrome can result in chronic eye inflammation and even corneal ulcers and permanent vision loss, in severe cases.