Dry eyes produce a cluster of symptoms that are easy to dismiss individually but hard to ignore together: stinging, burning, scratchiness, light sensitivity, and blurred vision that comes and goes. If you’ve noticed several of these in the past few weeks, especially if they affect both eyes, dry eye disease is a likely explanation. It affects anywhere from 5% to 50% of adults depending on how it’s measured, and rates have climbed sharply since the pandemic era of increased screen time.
The Most Common Symptoms
The hallmark feeling is a stinging, burning, or scratchy sensation, often described as having something stuck in your eye when nothing is there. Your eyes may look red. You might notice stringy mucus collecting in the corners. Light may bother you more than it used to, and nighttime driving can become difficult because of glare or hazy vision.
Contact lenses are often the first casualty. Lenses that once felt fine may start feeling uncomfortable by midday, or you may find yourself reaching for rewetting drops constantly. Blurred vision that clears temporarily when you blink is another telltale sign, because blinking redistributes whatever moisture is left across the surface of your eye.
Why Dry Eyes Can Make You Tear Up
One of the most confusing symptoms is watery eyes. It seems contradictory, but it’s actually one of the clearest signs of dryness. Your tear film has three layers: a mucus layer that sticks to the eye, a watery middle layer, and an oily outer layer that prevents evaporation. When any of these layers breaks down, the exposed surface irritates nerve endings on your cornea. Those nerves trigger a flood of emergency “reflex tears” to wash away the irritation.
The problem is that reflex tears are mostly water. They lack the oils and mucus needed to stick around and protect the surface, so they spill over your eyelids and run down your face without actually solving the dryness. This creates a cycle: the eye stays dry, keeps signaling for more tears, and the flooding continues. If your eyes water frequently, particularly in wind, dry air, or while reading, dry eye disease is a strong possibility.
Screens and Blinking
Digital screens are one of the most common triggers. When you focus on a screen, your blink rate drops dramatically. One study found that blink rate fell to roughly 42% of normal during computer use. Blinking is what spreads your tear film evenly across the eye, so fewer blinks means the film breaks apart faster, leaving dry patches on the cornea. You may notice that your symptoms are worst at the end of a workday or after a long stretch of reading, scrolling, or gaming, and better in the morning or after time outdoors.
A Quick Self-Assessment
Eye care professionals use a standardized questionnaire called the Ocular Surface Disease Index to screen for dry eye. You can use its logic at home to gauge your situation. Think about the past week and rate how often you experienced each of the following, from “none of the time” to “all of the time”:
- Irritation symptoms: eyes sensitive to light, eyes that feel gritty, painful or sore eyes
- Vision problems: blurred vision, poor vision, trouble reading, trouble driving at night, trouble using a computer, trouble watching TV
- Environmental triggers: discomfort in windy conditions, in low-humidity or very dry places, in air-conditioned rooms
On the clinical scale, which converts your answers to a score from 0 to 100, anything from 0 to 12 is considered a normal ocular surface. Scores of 13 to 22 suggest mild dry eye, 23 to 32 moderate, and 33 or above severe. You don’t need to calculate an exact number. If you answered “most of the time” or “all of the time” to several of those questions across multiple categories, that pattern points clearly toward dry eye disease.
What Might Be Causing It
Over 85% of dry eye cases involve the evaporative type, where tiny oil glands along your eyelid margins (called meibomian glands) aren’t working properly. These glands produce the oily outer layer of your tear film. When they clog or deteriorate, tears evaporate too quickly. You might notice crusty or irritated eyelid margins, or a thickened, yellowish discharge along the lash line.
The less common type, aqueous deficiency, means your tear glands simply aren’t producing enough of the watery component. This accounts for only about 10% of cases. Many people have a mix of both.
Several medications are known to reduce tear production or destabilize the tear film. Antihistamines are a frequent culprit, along with blood pressure medications (particularly beta-blockers), antidepressants, and anti-inflammatory drugs. If your dry eye symptoms started or worsened after beginning a new medication, the timing may not be coincidental.
Hormonal changes play a role too. Dry eye is more common in women, particularly after menopause. Aging in general reduces tear production. Environmental factors like air conditioning, heating, low humidity, and wind exposure all accelerate tear evaporation.
When Dry Eyes Signal Something Bigger
Persistent dry eyes combined with a dry mouth is a pattern worth paying attention to. This combination is highly suggestive of Sjögren’s syndrome, an autoimmune condition where the immune system attacks the glands that produce tears and saliva. In one study, the combination of dry eyes, dry mouth, and mouth soreness correctly identified 93% of Sjögren’s patients.
The diagnostic criteria for Sjögren’s include daily, persistent dry eyes lasting more than three months, a recurring sensation of sand or gravel in the eyes, and needing artificial tears more than three times a day. If you also experience a persistent dry mouth, difficulty swallowing dry food without liquids, or swollen salivary glands, these symptoms together warrant a thorough evaluation including blood tests for specific autoimmune markers.
How an Eye Doctor Confirms the Diagnosis
If your symptoms are persistent, an eye care professional can run a few straightforward tests to confirm dry eye and determine which type you have.
The tear breakup time test involves placing a small amount of dye on your eye and watching your tear film under a special light. In healthy eyes, the film stays intact for about 10 seconds. If it breaks apart in 5 seconds or less, that confirms an unstable tear film. The Schirmer test measures tear production by placing a tiny strip of filter paper inside your lower eyelid for five minutes. Less than 5 millimeters of wetting indicates low tear production. A tear osmolarity test measures how concentrated the salt in your tears is, since tears that are too salty suggest inadequate volume or excessive evaporation.
Your eye doctor will also examine the oil glands along your eyelid margins. Healthy glands release a clear, thin oil when gently pressed. Thick, discolored, or absent secretions indicate gland dysfunction, pointing to the evaporative type of dry eye. These tests together paint a clear picture of what’s going wrong and which layer of your tear film needs help.