If you have glaucoma, certain medications, habits, and everyday activities can raise the pressure inside your eyes and potentially speed up vision loss. Some of these are well known, like corticosteroid use, while others are surprisingly mundane, like how fast you drink water or what you wear around your neck. Here’s what the evidence says about each one.
Corticosteroids and Eye Pressure
Steroids are one of the biggest medication risks for people with glaucoma. Whether taken as eye drops, oral pills, inhaled for asthma, or applied as skin creams, corticosteroids can raise eye pressure significantly, sometimes by 6 to 22 mmHg, and the effect can persist for months after stopping treatment. About one-third of all people show a moderate pressure rise after topical steroid use, and roughly 4 to 6% of the population are “high responders” whose pressure can spike above 31 mmHg.
If you have glaucoma and need steroids for another condition, let your prescribing doctor know. Newer steroid formulations have less impact on eye pressure and may be substituted when possible. Never stop a prescribed steroid on your own, but do make sure every doctor you see knows about your glaucoma diagnosis.
Over-the-Counter Medications That Pose Risks
Several common drugstore medications can trigger a dangerous spike in eye pressure, particularly if you have narrow-angle glaucoma. The risk comes from ingredients that dilate the pupil or shift fluid dynamics inside the eye. Watch for these categories:
- Antihistamines and sleep aids: Ingredients like promethazine and diphenhydramine have anticholinergic effects that can dilate the pupil and precipitate an acute angle-closure attack.
- Decongestants: Pseudoephedrine, phenylephrine, and ephedrine, found in cold and flu remedies, nasal sprays, and some eye-redness drops, act on the same pathways.
- Asthma inhalers and nebulizers: Adrenergic bronchodilators can also affect pupil size and eye pressure.
The labels on many of these products carry a small warning about glaucoma, but it’s easy to miss. Get in the habit of reading the “Do not use if…” section on any OTC medication, and ask a pharmacist if you’re unsure about a specific product.
Heavy Lifting and Breath-Holding
When you hold your breath and strain, whether lifting something heavy, doing intense resistance training, or even coughing forcefully, your body performs what’s called a Valsalva maneuver. This compresses the veins in your chest, which pushes blood pressure backward through the jugular veins into the veins around your eyes. The result is engorgement of blood vessels in the eye and a temporary but meaningful spike in eye pressure.
You don’t have to give up exercise. The key is to breathe steadily during exertion. Exhale during the lifting phase of a repetition rather than holding your breath. Moderate-intensity aerobic exercise, like walking, swimming, or cycling, generally lowers eye pressure slightly over time. Playing wind instruments, which also involves sustained pressure in the chest, is worth discussing with your eye doctor if you do it frequently.
Drinking Large Amounts of Fluid Quickly
Chugging a large volume of liquid in a short time raises eye pressure in a measurable, predictable way. In clinical testing, when glaucoma patients drank one liter of water in five minutes, their average eye pressure rose from 14.8 mmHg at baseline to 19.3 mmHg within 30 minutes. The mechanism involves increased pressure in the small veins that drain the eye, which more than doubled in one study (from about 8 mmHg to 18 mmHg) within an hour of rapid water intake.
This doesn’t mean you should restrict your total fluid intake. Staying hydrated is important. The practical takeaway is to spread your drinking throughout the day rather than gulping large quantities at once. Sipping water regularly is fine; downing a full bottle in a few minutes is not ideal.
Caffeine in Large Amounts
Moderate coffee or tea consumption appears to be safe for most people with glaucoma. However, a large genetic study from the UK Biobank found that the picture changes for people who are already genetically predisposed to high eye pressure. In that group, consuming more than 321 mg of caffeine per day (roughly three to four cups of coffee) was associated with a 3.9-fold higher prevalence of glaucoma compared to people with low genetic risk who consumed no caffeine. For reference, a standard 8-ounce cup of brewed coffee contains about 80 to 100 mg of caffeine.
If you’re a heavy coffee drinker, you don’t necessarily need to quit. But if your eye pressure is difficult to control, cutting back to two or three cups a day is a reasonable, low-cost adjustment.
Smoking
Heavy smoking accelerates glaucoma progression. A long-term clinical follow-up study found that people who smoked 20 or more pack-years (the equivalent of a pack a day for 20 years, or two packs a day for 10) had 2.2 times the risk of measurable vision field loss compared to people who never smoked. Light to moderate smoking did not show the same statistical association, suggesting a dose-dependent relationship. Beyond eye pressure, smoking damages blood vessels throughout the body, which can compromise the already fragile blood supply to the optic nerve.
Tight Neckwear
It sounds trivial, but a tight necktie or snug collar can raise your eye pressure. A study published in the British Journal of Ophthalmology measured the effect and found that a tight tie increased eye pressure by an average of 2.6 mmHg in healthy subjects and 1.0 mmHg in glaucoma patients within just three minutes. Some individuals saw increases as high as 14 mmHg. The pressure returned to normal within three minutes of loosening the tie. The mechanism is the same as with heavy lifting: compression of the jugular veins restricts blood drainage from the head and eyes. If you wear ties or high-collared shirts regularly, keep them loose enough that you can comfortably fit a finger between the collar and your neck.
Sleeping Position
Eye pressure naturally rises when you lie flat, because gravity no longer helps drain fluid away from your head. Research on glaucoma patients found that sleeping with the head elevated at 20 to 35 degrees (roughly two pillows stacked) actually increased eye pressure, IOP fluctuation, and reduced blood flow to the eye compared to lying flat on the back. The likely culprit is compression of the jugular veins caused by neck flexion from the pillow stack. The takeaway from this research is that the angle and position of your neck matters more than simply propping your head up. If you sleep on your side, be aware that the eye closer to the pillow consistently experiences higher pressure. People with asymmetric glaucoma (worse in one eye) may benefit from sleeping with the more affected eye facing up.
Herbal Supplements Without Medical Guidance
Some supplements marketed for eye health, including ginkgo biloba, bilberry, and curcumin, have been studied for potential neuroprotective benefits in glaucoma. But “natural” does not mean risk-free. Certain herbal remedies can interfere with prescribed glaucoma medications or even raise eye pressure. High-dose curcumin, for example, carries a risk of liver toxicity. If you’re considering any supplement, bring the bottle to your next eye appointment so your doctor can check for interactions with your current treatment regimen.