Dry eye disease is a chronic condition where your tear film stops working properly, leaving the surface of your eyes inadequately protected and lubricated. It affects roughly 35% of the global population, with rates climbing to 37% in people over 40. Despite how common it is, many people dismiss their symptoms as minor irritation for years before realizing something treatable is going on.
The condition is more than just “not enough tears.” It involves a breakdown in the balance of your tear film, which has multiple layers working together to keep your eyes moist, clear, and comfortable. That breakdown triggers a cycle of inflammation, surface damage, and worsening symptoms that can become self-sustaining without intervention.
How the Tear Film Breaks Down
Your tear film is not a simple layer of saltwater. It contains water, oils, mucus, and proteins that work together to protect the eye’s surface, deliver nutrients, and maintain clear vision. When any part of this system falters, the tear film becomes unstable and evaporates too quickly, leaving patches of exposed tissue on the cornea.
There are two main pathways to dry eye. In the first, your eyes simply don’t produce enough of the watery component of tears. This form is sometimes linked to autoimmune conditions that gradually damage the tear-producing glands. In the second (and more common) form, the oil-producing glands along your eyelid margins, called meibomian glands, stop functioning normally. Without enough oil to seal the tear film’s surface, tears evaporate faster than they should. Many people have elements of both.
Regardless of the starting point, the result is the same: the tear film becomes saltier than normal, the cornea gets inflamed, and the inflammation further disrupts tear production. This vicious cycle is why dry eye tends to worsen over time without treatment.
What Dry Eye Feels Like
The symptoms usually affect both eyes and can fluctuate throughout the day. Common sensations include stinging or burning, a gritty feeling like something is stuck in your eye, light sensitivity, and eye fatigue. Your vision may blur intermittently, especially during prolonged reading or screen use, then clear briefly after you blink.
One of the most confusing symptoms is excessive tearing. It sounds contradictory, but watery eyes are actually a hallmark of dry eye disease. When the cornea becomes irritated, your body floods the surface with emergency reflex tears. These tears lack the balanced composition of normal tears, so they don’t solve the underlying problem. They just roll down your cheeks.
Other signs include stringy mucus around the eyes, redness, difficulty wearing contact lenses, and trouble with nighttime driving due to glare and halos.
Common Causes and Risk Factors
Age is the single biggest risk factor. Tear production naturally declines as you get older, and the oil glands in your eyelids tend to clog or atrophy with time. Women are affected more often than men, partly due to hormonal shifts during menopause.
Medications are a major and often overlooked contributor. In older adults, an estimated 62% of dry eye cases can be traced to systemic medications. The most common culprits include antihistamines, antidepressants, diuretics, blood pressure medications, anti-anxiety drugs, and even over-the-counter pain relievers like ibuprofen. If you started a new medication around the time your eyes became uncomfortable, it’s worth investigating the connection.
Screen use plays a significant role for people of all ages. You normally blink about 15 times per minute, but that rate drops to just 5 to 7 times per minute when you’re staring at a computer or phone. Each blink spreads a fresh layer of tears across the eye, so fewer blinks means more evaporation and more surface exposure. Hours of daily screen time can push a borderline tear film into symptomatic territory.
Other contributors include dry or windy environments, air conditioning, ceiling fans blowing directly on your face, contact lens wear, and a history of eye surgery.
How It’s Diagnosed
An eye care provider can diagnose dry eye through a combination of symptom questionnaires and simple in-office tests. One common test measures tear film stability by placing a small amount of dye on the eye and timing how quickly the tear film breaks apart under a blue light. A breakup time under 10 seconds is considered abnormal.
Another test uses a thin strip of filter paper placed gently inside the lower eyelid to measure tear volume. If the strip absorbs less than 10 millimeters of moisture over five minutes, tear production is below normal. Your provider may also examine the oil glands in your eyelids and look for signs of corneal surface damage under magnification.
Treatment Options
Treatment depends on how severe your symptoms are and what’s driving them. For mild cases, over-the-counter artificial tears are the starting point. These supplement your natural tear film and provide temporary relief. If you find yourself reaching for drops more than four times a day, switching to preservative-free single-use vials is a good idea. The preservatives in bottled drops can irritate the eye surface with frequent use, which defeats the purpose.
For moderate to severe disease, prescription eye drops target the underlying inflammation. One widely used option works by calming the immune cells on the eye’s surface that perpetuate the inflammatory cycle, gradually allowing tear production to recover over several months. A newer alternative blocks the interaction between specific inflammatory cells, reducing the overall immune response on the ocular surface. Both require consistent daily use, and it can take weeks to months before you notice meaningful improvement.
A more recent addition to the treatment landscape is a drop that works differently from anti-inflammatory options. Instead of targeting the immune system, it forms a thin barrier over the eye’s surface that slows tear evaporation, addressing the most common form of dry eye directly. It’s used four times daily.
For people whose dry eye stems from clogged oil glands, in-office procedures that warm and express the glands can restore oil flow. Warm compresses at home (a heated eye mask for 10 minutes daily) serve a similar, if less dramatic, purpose. Some providers also recommend omega-3 fatty acid supplements, though the evidence on their benefit is mixed.
Environmental and Lifestyle Adjustments
Small changes in your daily routine can meaningfully reduce symptoms. If you work at a screen for hours, the 20-20-20 rule helps: every 20 minutes, look at something 20 feet away for 20 seconds. This prompts more natural blinking and gives your tear film a chance to recover. Positioning your monitor slightly below eye level also helps, because it narrows the opening between your eyelids and reduces the exposed surface area where tears evaporate.
A desktop humidifier can offset the drying effects of air conditioning or forced-air heating. Wraparound glasses or moisture chamber spectacles create a humid microenvironment around your eyes when you’re outdoors in wind or dry conditions. Avoiding direct airflow from fans, car vents, or hair dryers aimed at your face makes a noticeable difference for many people.
What Happens Without Treatment
Dry eye that goes untreated for years can progress beyond discomfort into genuine tissue damage. Chronic inflammation of the cornea, called keratitis, can eventually penetrate deeper layers of the tissue and cause permanent scarring that impairs vision. In severe cases, the damaged corneal surface can develop open sores (corneal ulcers) that risk spreading to deeper structures of the eye. While total vision loss from dry eye alone is rare, it is possible when the condition is severe and entirely neglected.
Even short of these extremes, unmanaged dry eye erodes quality of life in ways that are easy to underestimate. Persistent discomfort, unreliable vision, and the inability to wear contacts or work comfortably at a screen add up over months and years. The condition responds best to early, consistent management rather than waiting until symptoms become severe.