Dry eye has a distinct set of symptoms that most people can recognize at home before ever seeing an eye doctor. The hallmark signs are a gritty or sandy feeling in your eyes, burning, stinging, and vision that blurs intermittently then clears when you blink. If those sound familiar, especially if they’ve been persistent for weeks, you’re likely dealing with some form of dry eye disease. It affects roughly 8.8% of women and 4.5% of men in the United States, with rates climbing sharply after age 50.
What Dry Eye Actually Feels Like
Dry eye produces a surprisingly wide range of sensations, which is part of why people aren’t always sure they have it. The most commonly reported feelings include grittiness or sandiness (as if something is stuck in your eye), burning or stinging, a dull pressure or aching around the eyes, heavy eyelids, and eye fatigue that worsens throughout the day. Some people describe it as sharp, others as throbbing. Many notice redness, light sensitivity, or a stringy mucus discharge collecting in the corners of their eyes.
One of the more confusing symptoms is excessive tearing. It sounds contradictory, but when your eyes are chronically dry, they sometimes overreact by flooding with low-quality, watery tears that don’t actually lubricate the surface. So if your eyes water constantly yet still feel irritated, that’s a classic dry eye pattern, not a sign that your tears are fine.
Vision changes are common too. Inadequate or poor-quality tears cause intermittent blurring or fluctuating vision, particularly during prolonged reading, driving, or screen use. The blur typically clears briefly after a full blink, then returns. If your vision seems to shift throughout the day without any change in your glasses prescription, dry eye is a likely culprit.
A Quick Self-Assessment You Can Do Now
Eye doctors use a standardized questionnaire called the Ocular Surface Disease Index (OSDI) to gauge dry eye severity. It’s a 12-question survey covering three areas: how your eyes physically feel, how your vision functions during daily tasks, and whether certain environments (wind, dry air, air conditioning) trigger your symptoms. Each question is scored from 0 (“none of the time”) to 4 (“all of the time”), producing a total score from 0 to 100.
The scoring breaks down like this:
- 0 to 12: Normal, no significant dry eye
- 13 to 22: Mild dry eye
- 23 to 32: Moderate dry eye
- 33 to 100: Severe dry eye
You can find the full OSDI questionnaire online and score yourself in a few minutes. It won’t replace a clinical exam, but it gives you a concrete number to track over time and brings useful information to your eye doctor if you decide to go.
Why Your Tears May Not Be Working
Dry eye falls into two broad categories, and knowing which type you have matters because the treatments differ.
The first is aqueous deficiency, meaning your tear glands simply don’t produce enough liquid. This is what most people picture when they think of dry eyes. It’s tested in a clinic by placing a small paper strip inside your lower eyelid for five minutes and measuring how much moisture it absorbs. A strip that wets more than 15 millimeters is normal. Less than 5 millimeters indicates a significant tear deficiency. Between 5 and 10 millimeters is considered moderately dry.
The second type, evaporative dry eye, is actually more common. Here, your tear glands produce enough liquid, but the oily outer layer of your tear film is deficient. That oil comes from tiny glands along the edges of your eyelids called meibomian glands. When those glands are clogged or dysfunctional, tears evaporate too quickly from the eye’s surface. Your doctor can evaluate this by measuring how many seconds your tear film remains stable after a blink. Many people have a combination of both types.
Screens, Environment, and Blink Rate
If your symptoms are worst during or after screen time, there’s a straightforward physiological explanation. During conversation, people blink about 17 times per minute. While reading on a screen, that rate drops to around 6 blinks per minute. Each blink spreads a fresh layer of tears across the eye, so cutting your blink rate by nearly two-thirds leaves the tear film exposed and evaporating for much longer stretches. This is why dry eye symptoms tend to peak in the afternoon or evening for office workers and anyone who spends hours on a phone, tablet, or computer.
Air conditioning, forced-air heating, airplane cabins, and windy outdoor conditions all accelerate tear evaporation and worsen symptoms. If you notice your eyes feel fine in the morning but progressively worse in certain rooms or weather, environmental factors are likely compounding your dry eye.
Medications That Cause or Worsen Dry Eye
Several common medications reduce tear production or destabilize the tear film. If your symptoms started or worsened after beginning a new prescription, it’s worth investigating the connection.
Antihistamines are among the most frequent offenders because they dry out mucous membranes throughout the body, including the eyes. Acne medications containing isotretinoin (commonly known by former brand names like Accutane) cause the oil-producing glands in the eyelids to shrink, leading to reduced tear film stability and increased tear saltiness. Studies using standardized dry eye questionnaires have confirmed significantly greater symptoms in people taking isotretinoin.
Certain cancer treatments, including hormone-blocking drugs used for breast cancer, have also been linked to dry eye. In one study of women taking aromatase inhibitors, 42.5% showed signs of meibomian gland dysfunction compared to just 12.5% of similar women not on the medication. Immune checkpoint inhibitors used in cancer immunotherapy can damage the glands responsible for tear and saliva production, causing both dry eyes and dry mouth. Beta-blockers, some antidepressants, and even certain diabetes medications have also been associated with dry eye symptoms.
What Happens at an Eye Exam
If self-assessment and symptom tracking point toward dry eye, a clinical exam can confirm it and identify which type you have. The visit is straightforward and painless. Your doctor will likely start with a symptom questionnaire similar to the OSDI, then move to a few quick tests.
The Schirmer test measures raw tear production. A small paper strip is hooked over your lower eyelid and left for five minutes while you keep your eyes closed. The wetted length tells your doctor whether your tear glands are producing enough volume. A newer version of this test uses a similar strip that takes only five seconds per eye and correlates well with the traditional method.
To check tear quality and stability, your doctor will place a drop of orange dye on your eye and watch your tear film under a blue light. They’ll time how many seconds it takes for the film to break apart after a blink. They may also examine the tiny oil glands along your eyelid margins for blockages. Some clinics measure tear saltiness (osmolarity) directly. Normal tears average around 302 mOsm/L. Mild to moderate dry eye pushes that to about 315 mOsm/L, and severe cases average around 336 mOsm/L. Higher saltiness means your tears are more concentrated, which irritates the eye surface.
Who Is Most at Risk
Dry eye prevalence rises steeply with age. Among adults 18 to 34, only about 2.7% are diagnosed. By age 75 and older, that jumps to 18.6%. Women are about twice as likely as men to develop dry eye, largely due to hormonal shifts during menopause that affect tear production.
Contact lens wearers are at elevated risk because the lens itself disrupts the tear film. People who have had LASIK or other refractive eye surgeries often experience dry eye for months afterward, and sometimes permanently. Autoimmune conditions, particularly Sjögren’s syndrome, rheumatoid arthritis, and lupus, frequently cause chronic dry eye as part of their broader inflammatory effects on the body.
If you’ve had prolonged redness, irritation, fatigue, or pain in your eyes that isn’t resolving on its own, that pattern is worth bringing to an eye care provider. Persistent symptoms, especially when paired with noticeable vision changes, suggest your tear film needs more than occasional eye drops to recover.