What are the two main causes of dry eyes?

Low tear production is the less common cause. It shows up more often after LASIK and in people managing autoimmune conditions, and it can sit on top of an oil-gland problem.

Everyday factors make both worse: long hours on screens reduce how often you blink, seasonal allergies inflame the eye’s surface, and fans, vehicle vents and CPAP machines push air across the eyes. Because treatment depends on which type you have, a dry eye evaluation looks at tear film stability, gland structure and the surface of the eye before recommending anything.

Full details: Dry eye treatment →