Dry eyes happen when your tears evaporate too quickly or your eyes don’t produce enough of them. The feeling can range from mild grittiness to outright burning, and it’s one of the most common eye complaints, with causes spanning everything from screen time to medications to hormonal shifts. The good news: most cases have a clear trigger you can identify and manage.
How Your Tear Film Works
Your eyes stay comfortable because of a thin tear film that coats the surface with every blink. This film has three distinct layers, and a problem with any one of them can leave your eyes feeling dry.
The outermost layer is an oily coating produced by tiny glands along your eyelid margins called meibomian glands. This oil prevents your tears from evaporating into the air and creates the smooth surface that keeps your vision sharp. Beneath that sits the watery (aqueous) layer, which makes up the bulk of the tear film. It lubricates, washes away debris, and delivers nutrients to the cornea, which has no blood supply of its own. The innermost layer is a thin mucus coating that helps the watery layer spread evenly across the eye’s surface and stick to it rather than sliding off.
When any of these layers is deficient, the tear film becomes unstable. Your eyes lose moisture faster than they can replenish it, and that’s when the dryness, stinging, or blurry vision kicks in.
Screens and Blinking
If your eyes feel driest during or after working on a computer, your blink rate is the likely culprit. You normally blink about 15 times per minute, but that rate can drop by half when you’re staring at a screen, reading, or doing other close-focus tasks. Each blink respreads the tear film across your eye. Fewer blinks mean more time for tears to evaporate between refreshes, leaving dry patches on the corneal surface.
This isn’t limited to computers. Phones, tablets, gaming, and even long stretches of reading a book all suppress your blink rate. The effect compounds over hours, which is why your eyes often feel worst by the end of a workday rather than at the start.
Environmental Triggers
Your surroundings play a bigger role than most people realize. Low humidity accelerates tear evaporation, and indoor environments during winter (with heating running) or summer (with air conditioning) can be particularly harsh. Indoor humidity of about 45% or higher is considered best for your eyes, but heated or air-conditioned rooms often fall well below that.
Ceiling fans, car vents pointed at your face, and windy outdoor conditions all push air across the eye’s surface and speed up evaporation. Even sleeping under a fan can leave you waking up with dry, gritty eyes if your lids don’t fully close overnight.
Medications That Dry Your Eyes
Dozens of common medications list dry eyes as a side effect, and in older adults, systemic medications account for an estimated 62% of dry eye cases. The most well-known offenders are antihistamines (the same drying effect that clears your sinuses also reduces tear production), but the list is much longer: antidepressants, blood pressure medications, diuretics, anti-anxiety drugs, pain relievers, and even some anti-inflammatory drugs can all contribute.
If your dry eye symptoms started or worsened around the same time you began a new medication, that connection is worth flagging with your prescriber. Sometimes a dosage adjustment or alternative medication can make a noticeable difference.
Hormonal Changes
Women are more likely to experience dry eyes than men, and the gap widens significantly around perimenopause and menopause. The drop in estrogen, progesterone, and testosterone that begins during perimenopause directly affects the meibomian glands, the ones responsible for the oily outer layer of your tear film. Lower hormone levels mean less oil, and lower-quality oil. When that protective layer thins out, tears evaporate too quickly, even if you’re producing a normal volume of them.
This type of dryness tends to be persistent rather than situational. It doesn’t go away when you step away from a screen or leave a dry room, because the underlying gland function has shifted.
Meibomian Gland Dysfunction
Clogged or underperforming meibomian glands are one of the most common drivers of chronic dry eye, regardless of age or sex. Studies estimate that meibomian gland dysfunction is present in anywhere from 12% to 55% of people with moderate-to-severe dry eye disease, depending on how strictly it’s defined. When these glands become blocked, the oily layer of the tear film breaks down and tears evaporate before they can do their job.
You can sometimes spot signs of this yourself. If your eyelid margins look red, crusty, or feel tender, or if warm compresses temporarily improve your comfort, gland dysfunction is a strong possibility. Over time, these glands can permanently atrophy if the blockage isn’t addressed.
Dry Eyes vs. Allergies
Dry eyes and eye allergies share several symptoms, including redness, watering, and mild itching, which makes them easy to confuse. The key difference is the intensity of the itch. Allergic conjunctivitis causes a pronounced, hard-to-ignore itching that dominates the symptom picture. Dry eyes, by contrast, tend to produce a wider mix of sensations: burning, stinging, a scratchy feeling like something is stuck in your eye, sensitivity to light, and intermittent blurry vision that clears with blinking.
This distinction matters because the treatments are different. Antihistamine eye drops that help allergies can actually make dry eyes worse by further reducing tear production.
What Your Eye Doctor Looks For
If dry eye symptoms persist, an eye doctor can measure how quickly your tear film breaks apart after a blink. This test, called tear break-up time, involves placing a small amount of dye on the eye and watching under a special light. A tear film that breaks up in less than 10 seconds is generally considered a sign of dry eye disease, and more precise techniques set the cutoff even lower, at around 5 seconds.
This measurement helps determine whether the problem is mainly evaporative (oil layer deficiency) or aqueous-deficient (not enough watery tears), which guides treatment.
Managing Dry Eyes at Home
Artificial tears are the first line of relief for most people. Over-the-counter lubricating drops come in two main forms: bottled drops with preservatives and preservative-free single-use vials. If you’re using drops more than six times a day, switch to a preservative-free formulation. The preservatives in bottled drops can irritate the eye’s surface with frequent use and actually worsen symptoms over time.
For screen-related dryness, the simplest intervention is deliberate blinking. Every 20 minutes, look away from your screen for 20 seconds and consciously blink several times. This won’t feel natural at first, but it recoats the eye surface and interrupts the evaporation cycle. Positioning your monitor slightly below eye level also helps, because it narrows the opening between your upper and lower lids and reduces the exposed surface area of the eye.
Warm compresses applied to closed eyelids for 5 to 10 minutes can soften blocked oil in the meibomian glands and improve the quality of the oily tear layer. This works best as a daily habit rather than an occasional fix. A humidifier in your bedroom or workspace can bring indoor humidity closer to that 45% threshold where eyes stay more comfortable. Directing air vents away from your face, whether at a desk or in a car, removes another common aggravator.
Prescription Options
When over-the-counter drops and environmental changes aren’t enough, prescription treatments target specific mechanisms. For people whose dry eye is driven by meibomian gland dysfunction, there’s now an FDA-approved drop specifically designed to stabilize the oil layer of the tear film and slow evaporation. It’s preservative-free and used four times daily.
For dry eye flares with significant inflammation, a short-course prescription steroid drop can reduce the inflammatory cycle on the eye’s surface. Longer-term prescription drops work by calming the immune response that perpetuates chronic dryness, allowing the eye’s surface to heal gradually over weeks to months. Your eye doctor may also recommend in-office procedures to physically unclog meibomian glands or insert tiny plugs in your tear drainage channels to keep tears on the eye longer.