Preventing dry eyes comes down to protecting and supporting your tear film, the thin layer of moisture that coats the surface of your eye with every blink. Most cases of dry eye result from either not producing enough tears or losing them too quickly to evaporation. The good news is that several straightforward habits can address both problems before they become chronic.
How Your Tear Film Works
Your tear film has three distinct layers, and each one plays a role in keeping your eyes comfortable. The outermost layer is an oil (lipid) layer that creates a smooth surface and slows evaporation. Beneath it sits a water layer that helps the tear film spread evenly across your eye. The innermost layer is a mucus coating that anchors everything in place, helping the whole film stick to the eye’s surface.
When any of these layers is disrupted, tears either evaporate too fast or fail to coat the eye properly. Prevention strategies target one or more of these layers, whether that means reducing evaporation, boosting tear production, or keeping the eye surface healthy overnight.
Blink More, Especially at Screens
You normally blink about 15 times per minute, but that rate drops by roughly half when you’re staring at a screen, reading, or doing other close-up work. Fewer blinks means your tear film isn’t being refreshed often enough, so it breaks apart and leaves dry patches on the cornea. Over a full workday, this adds up quickly.
The simplest fix is deliberate blinking. Every so often, close your eyes fully for a beat rather than the quick, partial blinks that tend to happen during focused tasks. Setting a timer to look away from your screen every 20 minutes and focus on something about 20 feet away for 20 seconds also helps your eyes reset. Position your monitor slightly below eye level so your eyelids naturally cover more of the eye’s surface, reducing the area exposed to air.
Keep Indoor Humidity Above 45%
Dry indoor air is one of the most overlooked contributors to eye discomfort. Heated rooms in winter, aggressive air conditioning in summer, and airplane cabins can all pull moisture from your tear film faster than your eyes can replace it. Indoor humidity of about 45% or higher is the threshold that best supports your eyes.
A simple tabletop humidifier near your workspace or bedside can make a noticeable difference, particularly during colder months when heating systems strip moisture from indoor air. You should also avoid sitting directly in the path of air vents, fans, or car heater outlets. Even a slight breeze aimed at your face accelerates tear evaporation.
Stay Hydrated
Whole-body hydration has a measurable connection to tear quality. Research published in Investigative Ophthalmology & Visual Science found that people with dry eye symptoms were significantly more dehydrated than those without, based on blood plasma measurements. When modestly dehydrated participants improved their hydration, tear salt concentration dropped from an elevated 335 down to 308 (measured in osmolarity units), which crossed the line from “dry eye” territory back into the normal range. That’s a large clinical effect from something as basic as drinking more water.
The relationship isn’t one-to-one. Drinking a glass of water won’t instantly wet your eyes the way eye drops would. But consistent mild dehydration appears to reduce tear secretion and concentrate the tears you do produce, making them less effective. Keeping up with regular fluid intake throughout the day is a low-effort way to support your tear film from the inside.
Check Your Medications
Medications are a major and frequently missed cause of dry eyes, particularly in older adults. An estimated 62% of dry eye cases in the elderly can be traced back to systemic medications. The list of culprits is long: antihistamines, antidepressants, diuretics, blood pressure medications, anti-anxiety drugs, NSAIDs like ibuprofen, and several others.
Many of these drugs share a common mechanism. They have what’s called anticholinergic activity, meaning they interfere with certain cell proteins that are essential for secreting tears, mucus, and oils. If you started a new medication and noticed your eyes becoming drier within weeks, that connection is worth raising with your prescriber. In some cases, an alternative drug with fewer drying effects is available.
Use Artificial Tears Strategically
Artificial tears can serve as both treatment and prevention. If you know your eyes tend to dry out during specific activities (long flights, extended reading, windy outdoor exercise), applying drops beforehand keeps the tear film intact rather than trying to rescue it after symptoms start.
If you’re using drops more than four times a day, choose preservative-free formulations. Preservatives in standard eye drops, while safe in small amounts, can irritate the eye surface with frequent use and actually worsen dryness over time. Preservative-free drops come in single-use vials and are gentler for heavy use. For occasional use, preserved drops are fine and more convenient.
Thicker gel drops last longer on the eye but can temporarily blur your vision, so they work best at bedtime. Thinner, watery drops are better for daytime use when you need clear sight.
Protect Your Eyes While You Sleep
Some people sleep with their eyelids slightly open without realizing it, a condition called nocturnal lagophthalmos. Even a small gap lets the exposed portion of the eye dry out over several hours. If you consistently wake up with dryness, a gritty foreign-body sensation, redness, blurry vision, or light sensitivity that improves as the day goes on, incomplete eyelid closure may be the cause.
Applying a thicker lubricating ointment before bed can protect the eye surface overnight. For more stubborn cases, some people tape their eyelids shut with medical-grade tape, or use moisture-retaining sleep masks that create a sealed environment around the eyes. If you suspect this is happening, a partner or family member can check whether your eyes are fully closed a few minutes after you fall asleep.
Warm Compresses for the Oil Layer
The oil layer of your tear film is produced by tiny glands along the edge of your eyelids called meibomian glands. When these glands get clogged, the oil layer thins out and tears evaporate too quickly. This is actually the most common form of dry eye.
A warm compress applied to closed eyelids for 5 to 10 minutes softens the thickened oil in those glands and helps them flow normally again. Microwavable eye masks designed for this purpose hold heat more consistently than a washcloth, which cools down fast. Doing this once daily, particularly before bed, can make a real difference over a few weeks. After the compress, gently massaging the eyelids from top to bottom helps express the loosened oil onto the eye surface.
Sunglasses and Wraparound Protection
Wind, dust, and UV exposure all stress the tear film. Wraparound sunglasses reduce airflow across the eye surface and block environmental irritants, making them especially useful for cycling, running, skiing, or spending time in dry, windy climates. Even on overcast days, wind alone can increase tear evaporation significantly. If you spend a lot of time outdoors, this single change can reduce how often you need drops.
Omega-3 Fatty Acids
Omega-3 fatty acids, found in fatty fish like salmon and mackerel, flaxseed, and walnuts, may help improve the oil component of your tear film. The evidence is mixed, with some large trials showing modest benefit and others showing none compared to placebo. Still, the biological rationale is sound: omega-3s have anti-inflammatory properties, and inflammation plays a role in many cases of chronic dry eye. Including these foods in your diet is unlikely to hurt and may provide a small additional benefit on top of other strategies.