Keeping your eyes comfortable and well-lubricated comes down to a handful of daily habits, most of which take almost no effort once you know what matters. Dry eyes happen when your tear film breaks down, either because you’re not producing enough tears or because they’re evaporating too fast. Both problems are largely preventable.
How Your Tear Film Works
Your tears aren’t just water. They’re a three-layer system: an outer oily layer that slows evaporation, a watery middle layer that provides moisture and nutrients, and an inner mucus layer that helps everything stick evenly to the eye’s surface. When any one of these layers falls short, your eyes feel gritty, irritated, or tired.
The oily outer layer is produced by tiny glands along the edges of your eyelids called meibomian glands. When those glands get clogged or sluggish, tears evaporate much faster than they should. This is the most common cause of chronic dry eyes, and it’s also one of the easiest to address at home.
Blink More During Screen Time
You normally blink about 15 times per minute. During computer or phone use, that drops to just 5 to 7 times per minute. That’s a reduction of more than half, which means your tear film is sitting exposed to the air far longer than it’s designed to between refreshes. Over a full workday, that adds up to hours of incomplete blinking.
The simplest fix is the 20-20-20 rule: every 20 minutes, look at something at least 20 feet away for 20 seconds. This naturally triggers fuller blinks and gives your tear film a chance to recover. Position your monitor slightly below eye level so your eyelids cover more of the eye’s surface, reducing the area exposed to evaporation. If you catch yourself staring, a few deliberate, slow blinks (closing your eyes fully for a beat) can re-spread the tear film immediately.
Keep Indoor Humidity Above 45%
Dry indoor air is one of the biggest environmental triggers for eye discomfort, especially during winter when heating systems pull moisture out of the air. Humidity levels of about 45% or higher are best for your eyes. A simple hygrometer (available for a few dollars) can tell you where your home or office stands, and a cool-mist humidifier in the room where you spend the most time is often all you need.
Fans, air conditioning vents, and car heaters blowing directly toward your face accelerate tear evaporation. Redirect vents away from your eyes whenever possible. If you sleep with a ceiling fan on, pointing it away from the bed or switching to a lower speed can make a noticeable difference by morning.
Use Warm Compresses for Your Eyelids
When the oily glands along your eyelid margins get clogged, the protective lipid layer of your tears thins out and evaporation speeds up. Warm compresses soften and liquefy those blocked oils so they flow normally again. Research shows the oils in these glands reach about 90% of their maximum fluidity at around 40 to 41.5°C (104 to 107°F), which is roughly the temperature of a comfortably warm washcloth or a microwavable eye mask.
Hold the compress against closed eyelids for about 10 minutes. A damp washcloth cools quickly, so you’ll need to rewarm it several times, or use a purpose-built heated eye mask that retains heat longer. Doing this once a day, especially before bed, keeps those glands functioning well. After removing the compress, gently massage along the lash line with clean fingernips to encourage oil flow.
Stay Hydrated
Whole-body dehydration directly affects your tears. In a controlled study, when healthy adults lost just 2 to 3% of their body mass through exercise and water restriction, their tear concentration (a marker of dryness) rose in lockstep with their blood concentration. When they rehydrated, tear quality returned to normal. A separate study in older adults found that a 48-hour rehydration program significantly reduced both blood and tear concentration, with tear levels dropping from 335 to 308 mOsm/L, well into the healthier range.
Some researchers now recognize a distinct category of dry eye caused purely by systemic dehydration, separate from gland dysfunction or low tear production. In practical terms, this means that for some people, drinking enough water throughout the day is the single most effective thing they can do for their eyes. There’s no magic number, but if your urine is pale yellow, you’re generally in good shape.
Check Your Medications
A surprising number of common medications reduce tear production as a side effect. The main categories include:
- Antihistamines (allergy medications like diphenhydramine, chlorpheniramine, and similar over-the-counter options)
- Blood pressure medications (beta blockers like propranolol and metoprolol, plus diuretics)
- Antidepressants (older tricyclic types like amitriptyline, nortriptyline, and imipramine)
- Birth control pills
- Acne treatments (isotretinoin is especially well known for causing significant dryness)
- Antipsychotics and tranquilizers
If you take any of these and notice persistent dryness, it’s worth bringing it up with your prescriber. Sometimes switching to a different medication in the same class or adjusting the dose resolves the problem entirely. Don’t stop a medication on your own, but do flag the symptom.
Choose the Right Contact Lenses
Contact lenses sit directly on the tear film, and the wrong type can make dryness dramatically worse. Daily disposable lenses are generally the best option for people prone to dry eyes, since a fresh lens each day means no protein or lipid buildup that would otherwise degrade comfort by the end of the week or month.
Not all dailies are equal, though. Lenses with high oxygen permeability and high surface water content tend to perform best. Some modern silicone hydrogel dailies have surface water content approaching 80 to nearly 100%, which helps maintain a stable tear film over the lens. If you wear monthlies and experience dryness in the afternoons, switching to a high-moisture daily lens is one of the most impactful changes you can make. Preservative-free rewetting drops designed for use with contacts can also help bridge the gap during long wear days.
Rethink Omega-3 Supplements
Omega-3 fatty acids from fish oil have long been recommended for dry eyes, and you’ll still see this advice everywhere. The evidence, however, is more mixed than most people realize. A major clinical trial gave participants 3,000 mg of omega-3 daily for 12 months and found they were not significantly better off than participants who took an olive oil placebo. That doesn’t mean omega-3s are useless for every individual, but it does mean they’re unlikely to be the game-changer many people hope for.
If you already eat fatty fish a couple of times a week, you’re probably getting as much benefit as supplements would provide. Spending your effort on warm compresses, hydration, and environmental adjustments will almost certainly yield more noticeable results.
Protect Your Eyes Outdoors
Wind is a direct cause of tear evaporation. On windy days, wraparound sunglasses create a buffer zone of still, slightly more humid air around your eyes. This is especially useful if you run, cycle, or ski, where airflow across the eyes is constant. Even on calm days, UV exposure can irritate the ocular surface over time, so sunglasses serve double duty.
If you live in an arid climate or at high altitude, where both humidity and oxygen pressure are lower, these outdoor precautions become even more important. Keeping preservative-free artificial tears on hand for after outdoor activities can help restore comfort quickly.