Dry eye feels like a stinging, burning, or scratchy sensation in your eyes, often with the feeling that something is stuck in them. These symptoms typically affect both eyes and can range from mildly annoying to genuinely disruptive. If you’ve been experiencing some combination of these sensations for more than a few days, dry eye disease is a likely explanation.
The Most Common Symptoms
Dry eye produces a cluster of symptoms that overlap but vary from person to person. The hallmark signs are a gritty or scratchy feeling, burning, and the persistent sensation of a foreign body in your eye. You might also notice redness, sensitivity to light, blurry vision that comes and goes (especially during reading or screen use), and stringy mucus around your eyes.
One of the most counterintuitive symptoms is watery eyes. Your eyes can actually tear up excessively as a reflex response to dryness on the surface. These reflex tears are mostly water, though, and lack the oils and mucus that make a healthy tear film stable. So the flooding doesn’t fix the problem.
When Your Symptoms Happen Matters
Pay attention to timing. If your eyes feel worst when you first wake up, the issue is more likely related to low tear production. Your eyes aren’t making enough of the watery layer of your tear film, and overnight they dry out significantly. This type of dry eye can sometimes signal an underlying autoimmune condition that damages the glands responsible for tear production.
If your symptoms get worse as the day goes on, the more likely culprit is your tears evaporating too quickly. This happens when the tiny oil glands along your eyelid margins aren’t working properly. Without that thin oil layer sitting on top of your tears, moisture escapes from the eye surface faster than it should. This evaporative type is the more common of the two and is closely tied to screen habits, environment, and age.
Screen Time and Blinking
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 surface, so cutting your blink rate by more than half means your tear film is breaking down and reforming far less often. If your symptoms are worst during or after long stretches of screen use, reduced blinking is almost certainly a factor.
Medications That Can Cause Dry Eye
Several common medications reduce tear production as a side effect. Antihistamines are one of the biggest offenders, which creates an unfortunate catch-22 if you’re taking them for allergies that also irritate your eyes. Blood pressure medications like beta-blockers, diuretics, birth control pills, certain antidepressants, and ulcer medications can all contribute. If your symptoms started or worsened around the time you began a new medication, that connection is worth exploring with your prescriber.
Dry Eye vs. Allergies
The symptoms of dry eye and eye allergies overlap enough to cause real confusion. Both can cause redness, watery eyes, light sensitivity, and blurry vision. The key difference is itching. While dry eye can cause a mild itch, allergic conjunctivitis produces an intense urge to rub your eyes that’s hard to ignore. If the itching comes alongside a runny nose or sneezing, allergies are the more likely explanation. Dry eye, by contrast, leans more toward burning, stinging, and that foreign-body sensation.
Swelling or puffiness around the eyelids also points more toward allergies. And dry eye symptoms tend to be chronic and fairly consistent day to day, while allergy symptoms often flare seasonally or after specific exposures like pet dander or pollen.
How Doctors Test for Dry Eye
If you suspect dry eye, an eye care provider can run several quick, painless tests to confirm it and gauge severity.
The Schirmer test measures how much moisture your eyes produce. A small strip of filter paper is placed inside your lower eyelid for five minutes. If the strip absorbs more than 10 millimeters of moisture, tear production is considered normal. Less than that suggests your eyes aren’t producing enough tears.
Another common test measures how quickly your tear film breaks apart after a blink. A drop of dye is placed on the eye, and the doctor watches through a special light to see how many seconds pass before dry spots appear. If your tear film breaks up in under 10 seconds, it’s considered unstable.
Some clinics also measure tear osmolarity, which tells how concentrated the salt content of your tears is. Normal is below 300 mOsm/L. Values between 300 and 320 indicate mild dry eye, 320 to 340 is moderate, and above 340 is severe. Higher salt concentration means less water in the tear film, which irritates the eye surface.
A Quick Self-Assessment
Eye doctors often use a standardized questionnaire called the Ocular Surface Disease Index to screen for dry eye. It scores from 0 to 100 based on how frequently you experience specific symptoms and how much they interfere with daily activities. A score of 0 to 12 is normal. Scores of 13 to 22 suggest mild dry eye, 23 to 32 moderate, and anything above 33 indicates severe disease. You can find versions of this questionnaire online, and while it’s not a substitute for an exam, it can help you gauge whether your symptoms are worth bringing up at your next appointment.
What Happens if You Ignore It
Mild dry eye is common and manageable, but leaving significant dry eye untreated over time can lead to damage on the surface of the cornea. A chronically dry cornea is more vulnerable to scratches and infections. In severe cases, this can progress to corneal ulcers, scarring, and permanent changes in vision. The earlier you address persistent symptoms, the easier they are to manage and the less likely they are to cause lasting harm.