Can Dry Eyes Cause High Eye Pressure?

Dry eye disease does not directly raise intraocular pressure (the fluid pressure inside your eye) in most people. Population-level studies point in different directions, and when researchers have measured the corneal and pressure characteristics of dry eye patients head-to-head against healthy controls, the differences tend to be small or nonexistent. But the relationship between the two conditions is genuinely tangled, because inflammation, medications, habitual eye rubbing, and shared risk factors like aging create multiple indirect paths by which dry eyes and elevated eye pressure end up in the same person at the same time.

What Large Studies Actually Show

If dry eyes reliably caused high eye pressure, you would expect population surveys to find higher pressure readings in people who report dry eye symptoms. The evidence is mixed. A large Korean national health survey found the opposite: after adjusting for confounders, people with dry eye disease had slightly lower intraocular pressure than those without it, and this trend was statistically meaningful only in men. Men with dry eye disease were far less likely to have high eye pressure than men without it.¹

On the other hand, a French population study of elderly adults found that dry eye was more common among people who already had ocular hypertension, with roughly 60 percent higher odds of dry eye in that group compared to those with normal pressure.² That does not mean the dry eye caused the high pressure. It means the two conditions travel together in older adults, and teasing apart which came first is difficult in a snapshot survey. Much of that overlap likely comes from shared medications and shared risk factors rather than one condition driving the other.

When researchers have looked more closely at the physical properties of the cornea in dry eye patients versus controls, the picture flattens out. A study comparing corneal biomechanics and pressure readings between the two groups found no statistically significant differences in corneal thickness, corneal resistance, or cornea-corrected intraocular pressure.³ In other words, dry eye by itself does not seem to warp the cornea in a way that would systematically throw off pressure measurements or drive pressure upward.

How Inflammation Could Theoretically Raise Pressure

Even though the population data does not show a clear link, there is a biological argument for how severe, chronic dry eye could contribute to elevated pressure in some individuals. The fluid inside your eye drains through a tissue called the trabecular meshwork, a tiny mesh-like structure near the junction of the iris and cornea. When that tissue becomes inflamed or scarred, fluid backs up and pressure rises.

Researchers studying glaucoma patients with significant ocular surface disease have proposed that chronic surface inflammation can extend deeper into the eye, reaching the trabecular meshwork and interfering with fluid drainage.⁴ The theory is that long-standing inflammation from the surface, sometimes compounded by toxic preservatives in eye drops, can scar the episclera and sclera in ways that further restrict outflow.⁵ In a small case series, treating the surface disease and removing toxic drops led to measurable pressure improvements, supporting the idea that surface inflammation had been contributing to higher pressure in those particular patients.

This mechanism is plausible but probably applies only to severe, chronic cases where inflammation has been present for years. It does not mean that ordinary dry eye from screen work or contact lens wear is pushing your eye pressure into a dangerous range.

The Reverse Problem: Glaucoma Drops That Cause Dry Eye

A large part of the reason dry eye and high eye pressure so often appear together has nothing to do with dry eye raising pressure. It is the opposite: the treatments for high pressure damage the eye surface and create dry eye symptoms. This reverse causality is one of the most important things to understand if you have been told you have both conditions.

Glaucoma is typically managed with daily eye drops, and many of those drops contain preservatives and active ingredients that irritate the ocular surface over time. A study following glaucoma patients over one year found that their lipid layer thickness, a marker of tear quality, was significantly reduced compared to controls, and patients reported worsening dry eye symptoms.⁶ Research from Ethiopia found that corneal staining and tear breakup time, two objective signs of surface damage, correlated with the number of glaucoma drugs a patient was using and the total number of drops applied each day.⁷ Patients on certain older medications like pilocarpine and timolol had worse surface damage than those on newer drugs.

A prospective study estimated that roughly two-thirds of glaucoma patients on long-term preserved eye drops showed signs and symptoms of dry eye syndrome, and that prolonged use of preservative-containing medications was the key driver.⁸ So if you have glaucoma and are developing dry eye, the pressure-lowering drops you rely on may be the culprit, not the other way around.

The Eye-Rubbing Factor

Here is an indirect connection between dry eyes and pressure that most people overlook: rubbing. Dry, irritated eyes itch and burn, and the instinctive response is to rub them. That reflex can temporarily spike eye pressure to alarming levels.

A study using implanted pressure sensors in glaucoma patients measured what happens during different eyelid actions. Rubbing the eyes produced an average peak pressure increase of about 59 mmHg above baseline, and squeezing the lids shut caused an average spike of roughly 42 mmHg.⁹ For context, normal eye pressure sits between about 10 and 21 mmHg. A 59 mmHg jump is enormous, even if brief. Voluntary blinking caused a much smaller increase of around 12 mmHg, and involuntary blinking caused essentially no change.

These spikes are transient, lasting only moments. But if you have chronically dry eyes and rub them dozens of times a day, those repeated pressure surges could matter, especially if you already have glaucoma or are at risk for it. The pressure spikes from rubbing are well-documented as a concern in keratoconus (a condition where the cornea thins and bulges), and the same mechanical forces apply to the optic nerve. Addressing the dry eye itself, so that you stop rubbing, is one practical way to reduce these spikes.

Steroid Eye Drops for Dry Eye and Pressure Risk

One of the few realistic ways dry eye treatment could directly cause a pressure increase involves corticosteroid eye drops. Steroids are potent anti-inflammatory agents, and doctors sometimes prescribe them for moderate-to-severe dry eye flares to break the inflammation cycle. A well-known side effect of steroid eye drops is raised intraocular pressure, which can happen in susceptible individuals within weeks of starting treatment.

The risk depends heavily on the type of steroid, the dose, and how long you use it. A randomized trial of low-dose preservative-free hydrocortisone drops for chronic dry eye found that intraocular pressure did not change in either the treatment or control group over the study period.¹⁰ That is reassuring for short courses of mild steroids. But stronger steroids like prednisolone or dexamethasone at higher doses carry a real pressure risk, which is why doctors monitor pressure during treatment and often limit courses to a few weeks.

If your dry eye is being managed with steroid drops and you notice headaches, eye pain, or worsening vision, have your pressure checked. The fix is usually tapering off the steroid and switching to a non-steroidal anti-inflammatory or an immunomodulating drop like cyclosporine, which does not raise pressure.

Preservatives in Eye Drops

Benzalkonium chloride, known as BAK, is the most widely used preservative in ophthalmic drops, from over-the-counter artificial tears to prescription glaucoma medications. It is also genuinely toxic to the cells of the eye surface. Laboratory research has shown that BAK inhibits mitochondrial energy production in eye cells at concentrations far below what is found in commercial eye drops.¹¹ Over months and years of use, this cellular damage contributes to the ocular surface disease seen in long-term drop users.

You might wonder whether all that surface toxicity also drives up eye pressure. A systematic review and meta-analysis of 16 studies, covering over 4,000 patients, compared BAK-preserved drops to preservative-free or alternatively preserved formulations and found no significant difference in intraocular pressure between them.¹² There were also no meaningful differences in ocular redness, total adverse events, or tear breakup time across those studies. So while BAK harms the eye surface, switching to preservative-free drops does not appear to lower pressure on its own. The benefit of preservative-free formulations is comfort and surface health, not pressure reduction.

Screen Time, Dry Eyes, and Pressure

Prolonged screen use is one of the most common triggers for dry eye symptoms in working-age adults, mainly because people blink less often when staring at a screen. Could all that screen time also push eye pressure up? A systematic review and meta-analysis examined the evidence and found that among healthy participants, intraocular pressure rose by about 1.5 mmHg after 25 minutes of screen exposure, then returned to baseline afterward.¹³ In people with glaucoma, the rise was slightly larger and appeared sooner: about 1.1 mmHg at 5 minutes and 2.5 mmHg at 25 minutes.

These are small, temporary bumps, and pressure returned to normal once the screen session ended. But for someone with borderline-high eye pressure or poorly controlled glaucoma, repeated daily sessions could mean hours of mildly elevated pressure. The dry eye symptoms and the pressure effect here share a trigger rather than one causing the other. Taking breaks from the screen helps both the surface dryness and the transient pressure rise.

Aging as a Shared Risk Factor

Both dry eye and elevated eye pressure become much more common with age, and this overlap creates a statistical illusion that the two conditions are more tightly linked than they actually are. Aging brings changes to tear gland function, meibomian gland structure, and hormonal balance that all promote dry eye. Simultaneously, the trabecular meshwork stiffens and becomes less efficient at draining fluid, nudging eye pressure higher. Cardiovascular diseases, diabetes, depression, and the medications used to treat them can all independently worsen the eye surface.¹⁴

Certain systemic medications commonly used in older adults, including antihistamines, antidepressants, and some blood pressure drugs, can reduce tear production or alter tear composition. Others can affect aqueous humor dynamics inside the eye. When a person over 60 presents with both dry eye and elevated pressure, teasing apart the individual contributions of aging, systemic medications, and local eye drops can be genuinely difficult. The practical takeaway is that finding one of these conditions in an older adult is reason enough to screen for the other.

Microcirculation Changes in Dry Eye

An emerging area of research looks at blood flow on the surface of the eye. Investigators have found that people with dry eye disease tend to have higher blood flow velocity, flow rate, and vessel density in the tiny blood vessels of the conjunctiva compared to healthy controls.¹⁵ These vascular changes reflect the inflammatory state of the eye surface. Whether they contribute to changes in intraocular pressure is still speculative; the drainage system for aqueous humor operates through different vascular pathways than the surface vessels measured in these studies. Still, the finding is worth watching, because some theories of glaucoma involve reduced perfusion and vascular dysregulation in the optic nerve, and any condition that alters local blood flow could theoretically interact with those mechanisms over time.

Managing Both Conditions at the Same Time

When dry eye and high eye pressure coexist in the same patient, the clinical challenge is that treating one can aggravate the other. Glaucoma drops dry out the surface; steroid drops for dry eye can raise pressure; and simply adding more drops increases preservative exposure and worsens surface toxicity. Clinicians and researchers increasingly advocate for strategies that reduce the total drop burden.

Several approaches can help:

Preservative-free glaucoma drops: Switching from BAK-preserved formulations to preservative-free versions protects the ocular surface without sacrificing pressure control.
Laser trabeculoplasty: Selective laser trabeculoplasty can be used as a first-line treatment for open-angle glaucoma in place of daily drops. It avoids the surface toxicity entirely and has been associated with less redness and irritation compared to drop-based therapy.¹⁶
Minimally invasive glaucoma surgery (MIGS): For patients who need surgical pressure reduction, MIGS procedures have been found to reduce the number of glaucoma medications required, which in turn improves surface health and dry eye symptoms.
Treating the surface first: In some cases, managing the dry eye aggressively before fine-tuning glaucoma therapy can clarify what the “true” eye pressure is, because an inflamed surface may be contributing to measurement artifact or to genuine outflow obstruction.¹⁷

Punctal Plugs and an Unexpected Pressure Benefit

Punctal plugs are tiny devices inserted into the tear drainage openings on your lower eyelids. They block tear outflow and keep your natural tears on the eye surface longer, which is a standard treatment for moderate-to-severe dry eye. What’s interesting is that several studies have found a secondary benefit: a modest reduction in intraocular pressure in patients using glaucoma drops.

An early study of 19 glaucoma patients found that the eye with a punctal plug showed a statistically significant pressure decrease averaging about 1.8 mmHg compared to the same eye before plugging.¹⁸ A later trial using silicone plugs alongside travoprost, a common glaucoma drop, confirmed a clinically and statistically meaningful additional IOP reduction when the plug was in place.¹⁹ A more recent preliminary study found the same pattern: plugs lowered both dry eye signs and eye pressure in patients who had both conditions.²⁰

The most likely explanation is that plugging the tear drain keeps the glaucoma medication on the eye surface longer, allowing more of the drug to be absorbed and less to be washed away. So the plug is not lowering pressure through some direct dry-eye mechanism; it is making the existing glaucoma treatment work better. That said, if you have both dry eye and borderline pressure, this is a two-for-one intervention worth discussing with your ophthalmologist. A single plug addresses comfort and may squeeze a bit more pressure reduction out of the drops you are already using.