Dry eyes happen when your tears evaporate too quickly, when your eyes don’t produce enough tears, or both. It’s one of the most common eye complaints, affecting roughly 35% of adults under 40 and nearly 39% of women across all age groups. The good news: once you identify what’s driving your dryness, most cases are manageable with straightforward changes.
The Two Main Types of Dry Eye
Your tear film isn’t just saltwater. It has three layers: an oily outer layer that prevents evaporation, a watery middle layer that hydrates and nourishes, and a mucus layer that helps tears stick to the eye’s surface. Dry eye falls into two categories depending on which part of this system breaks down.
Evaporative dry eye is the more common type, responsible for about 50% of cases on its own and contributing to another 36% of mixed cases. It happens when the tiny oil glands along your eyelid margins (called meibomian glands) become clogged or dysfunctional. Without that protective oil layer, your tears evaporate far too fast. People with this type often notice their eyes feel worst in the morning, because overnight bacterial activity breaks down the oils into irritating compounds. You might see debris floating in your tear film or notice crusty, waxy buildup along your lash line.
Aqueous deficient dry eye accounts for about 14% of cases in pure form. Here, the glands that produce the watery component of tears simply don’t make enough. Symptoms tend to worsen as the day goes on because whatever tears you do produce slowly evaporate. Burning, stinging, a gritty “something in my eye” sensation, and vision that gets progressively blurrier through the afternoon are hallmarks.
Many people have a mix of both, which is why dry eye can feel unpredictable.
Common Causes and Triggers
Medications
A surprisingly long list of medications reduce tear production as a side effect. The most common culprits include antihistamines (like diphenhydramine and chlorpheniramine), certain antidepressants, beta blockers used for blood pressure, diuretics, birth control pills, and acne medications like isotretinoin. If your dry eyes started or worsened around the time you began a new medication, that connection is worth exploring with your prescriber.
Screen Time and Environment
You blink about 66% less often when staring at a screen, which gives your tears more time to evaporate between blinks. Combine that with air conditioning, forced-air heating, or ceiling fans, and you’ve created a perfect storm for dryness. Indoor humidity below 45% accelerates tear evaporation significantly. If you live in a dry climate or spend winters with the heat running, a humidifier in your workspace or bedroom can make a noticeable difference. Aim for 45% relative humidity or higher.
Contact Lenses
Contacts sit directly on the tear film and can absorb moisture from it, accelerating evaporation. Long wear times and sleeping in lenses make this worse. Switching to daily disposable lenses or giving your eyes regular breaks with glasses can help.
Aging and Hormones
Tear production naturally declines with age, and hormonal shifts play a major role. Estrogen and androgen levels influence how much oil and water your tear glands produce, which is why women, particularly during and after menopause, develop dry eye at significantly higher rates than men.
Autoimmune Conditions
Persistent, severe dry eye that doesn’t respond to basic treatments can signal an underlying autoimmune condition. Sjögren’s syndrome is the most well-known, a disease where the immune system attacks moisture-producing glands throughout the body, including tear and saliva glands. Rheumatoid arthritis, lupus, and thyroid disorders can also cause or worsen dry eye. If you have dry mouth alongside dry eyes, or a family history of autoimmune disease, that’s worth mentioning to your doctor.
There’s also a neuropathic component to some cases, where the nerves on the corneal surface don’t signal properly. This can make your eyes feel painfully dry even when tear production looks normal on testing.
What to Try First
Over-the-counter artificial tears are the starting point for most people. They come in two main forms: preserved and preservative-free. If you’re using drops more than four times a day, or if your eyes are moderately to severely dry, go with preservative-free single-use vials. The preservatives in multi-use bottles, particularly one called benzalkonium chloride, can irritate already-inflamed eyes with repeated use.
For evaporative dry eye specifically, warm compresses can help unclog those oil glands. Hold a warm, damp washcloth over your closed eyes for five to ten minutes, then gently massage your eyelids along the lash line. Doing this daily can improve oil flow over a few weeks.
The 20-20-20 rule helps with screen-related dryness: every 20 minutes, look at something 20 feet away for 20 seconds. This prompts you to blink fully and gives your tear film a chance to recover.
Omega-3s and Tear Quality
Omega-3 fatty acids from fish oil have been studied extensively for dry eye. They appear to improve the oily layer of the tear film and reduce inflammation on the eye’s surface. The dosage used in most research studies was 180 milligrams of EPA and 120 milligrams of DHA, taken twice daily. That’s a modest dose, roughly what you’d get from one standard fish oil capsule twice a day. Results aren’t instant. Most people need at least six to eight weeks of consistent use to notice a difference, and the effect is modest rather than dramatic.
When OTC Drops Aren’t Enough
If artificial tears and lifestyle adjustments aren’t cutting it after a few weeks, prescription options can target the underlying inflammation that drives chronic dry eye. Two main prescription drops work by calming the immune response on your eye’s surface, reducing the cycle of inflammation and dryness that feeds on itself.
One of these (lifitegrast) can improve symptoms in as little as two weeks, with most patients noticing meaningful relief by four to six weeks. The other (cyclosporine) tends to take longer, often two to three months before the full benefit kicks in. Both can cause temporary stinging or burning when first applied, which usually lessens over time.
For people who don’t produce enough tears, a minor in-office procedure can place tiny plugs in the tear drainage ducts at the inner corners of your eyes. This keeps whatever tears you do make on the eye’s surface longer, rather than draining into your nasal passages. The plugs are painless, reversible, and often provide noticeable relief within days.
Symptoms That Need Prompt Attention
Most dry eye is uncomfortable but not dangerous. However, certain symptoms during a flare warrant a timely visit to an eye doctor: sudden blurred or fluctuating vision, significant eye pain (not just mild irritation), pronounced redness, or symptoms that are noticeably worsening despite treatment. Severe, untreated dry eye can damage the corneal surface over time, so new or escalating symptoms shouldn’t be brushed off as “just dryness.”