Dry eyes happen when your tears evaporate too quickly or when your eyes don’t produce enough tears to stay lubricated. Most cases fall into one of those two categories, and many people have a combination of both. The good news is that once you identify what’s driving your dryness, most cases respond well to targeted changes or treatment.
The Two Types of Dry Eye
Your tear film isn’t just water. It has three layers: an oily outer layer, a watery middle layer, and a mucus layer that helps tears stick to your eye’s surface. Problems with any of these layers can leave your eyes feeling dry, gritty, or irritated.
The most common type is evaporative dry eye, where the oily outer layer breaks down and your tears evaporate faster than they should. This is usually caused by clogged or poorly functioning oil glands along your eyelid margins, called meibomian glands. When those glands get blocked, bacteria build up and change the consistency of the oil they produce, making it too thick to spread across your tears. Without that protective oil layer, your tears dry out on the surface of your eye within seconds.
The less common type is aqueous deficiency, where your tear glands simply don’t produce enough of the watery component. This can sometimes point to an underlying autoimmune condition that gradually damages the glands responsible for tear production.
Screen Time Is a Major Culprit
You normally blink about 15 times per minute. When you’re staring at a computer, phone, or tablet, that drops to roughly 5 to 7 times per minute. Each blink spreads a fresh layer of tears across your eye, so cutting your blink rate by more than half means your tears have far more time to evaporate between refreshes. If your eyes feel worse by the end of the workday, this is likely a big part of the reason.
The 20-20-20 rule helps: every 20 minutes, look at something 20 feet away for 20 seconds. This gives your eyes a break and encourages a more natural blink pattern. Positioning your screen slightly below eye level also helps, since looking downward reduces the amount of exposed eye surface.
Medications That Dry Your Eyes
A surprisingly long list of common medications reduce tear production as a side effect. The main categories include:
- Antihistamines (diphenhydramine, chlorpheniramine, and similar allergy medications)
- Antidepressants (amitriptyline, nortriptyline, imipramine, desipramine)
- Blood pressure medications (beta blockers like propranolol and metoprolol, plus diuretics)
- Birth control pills
- Acne medication (isotretinoin is particularly notorious for causing severe dryness)
- Anti-nausea and tranquilizer medications
If your dry eyes started around the same time you began a new medication, that connection is worth exploring with whoever prescribed it. Sometimes switching to a different drug in the same class can make a real difference.
Environmental Factors
Low humidity is one of the strongest environmental triggers for dry eyes. Heated indoor air in winter, air-conditioned offices in summer, and airplane cabins all pull moisture from your tear film faster than your glands can replace it. Direct airflow from fans, vents, or car heaters pointed at your face makes it worse.
Outdoor conditions matter too. Wind, high altitude, and air pollution all increase tear evaporation. Temperature extremes in either direction can disrupt the balance of your eye’s surface. If you notice your symptoms flare in specific environments, that’s a strong clue that evaporation is a primary driver of your dryness.
Hormonal Changes
Dry eye is significantly more common in women, particularly after menopause. The meibomian glands that produce your tear film’s protective oil layer are influenced by hormones, specifically androgens like testosterone. As androgen levels decline with age (especially in women), those oil glands may not function as well, leading to thinner, less stable tears. People with conditions that affect how the body responds to androgens also tend to show altered oil gland secretions and more dry eye symptoms.
What Happens if You Ignore It
Mild dry eye is uncomfortable but not dangerous. Chronic, untreated dry eye is a different story. When your cornea (the clear front surface of your eye) stays dry for too long, it becomes vulnerable to inflammation, tiny abrasions, and in severe cases, corneal ulcers. These ulcers can scar and lead to permanent vision changes. The irritation also triggers a cycle where inflammation damages the very glands that produce tears, which makes the dryness worse, which causes more inflammation.
What You Can Do at Home
Artificial tears are the first line of defense for most people. Preservative-free drops are gentler if you’re using them more than four times a day. Look for drops labeled for your specific type of dryness: lipid-based drops help with evaporative dry eye, while traditional artificial tears add volume for aqueous deficiency.
Warm compresses held over closed eyes for 5 to 10 minutes can help soften blocked oil in your eyelid glands, improving the quality of your tear film over time. This works best when done consistently, not just when symptoms flare.
Omega-3 fatty acid supplements have shown benefit in some studies. Research doses typically used 180 milligrams of EPA and 120 milligrams of DHA, taken twice daily. You can also get these through fatty fish like salmon, mackerel, and sardines. A humidifier in your bedroom or office can raise the ambient moisture level enough to noticeably reduce evaporation.
When Home Remedies Aren’t Enough
If artificial tears and lifestyle changes aren’t controlling your symptoms, an eye doctor can assess exactly what’s going on. One common test measures how quickly your tear film breaks apart after a blink. Anything under 10 seconds is considered abnormal and suggests your tears aren’t stable enough to protect your eye between blinks. Another test uses a small strip of paper placed at the edge of your lower eyelid to measure tear production directly.
For moderate to severe cases, one option is punctal plugs: tiny inserts placed in your tear drainage channels to keep tears on your eye longer. They work like a drain stopper in a bathtub. Temporary versions made of collagen dissolve in about a week, which lets you test whether blocking drainage helps before committing to something longer lasting. Semi-permanent plugs last weeks to months, and silicone plugs can stay in place indefinitely. The procedure takes minutes and is painless.
Prescription anti-inflammatory drops can also break the cycle of dryness and inflammation that makes chronic dry eye self-perpetuating. For people with significant meibomian gland blockage, in-office treatments that apply gentle heat and pressure to the eyelids can clear the glands more effectively than warm compresses alone.