Lifestyle, Diet & Medication Risk Review
Before any drop, laser, or surgery, effective glaucoma care starts with a comprehensive medical and medication history, and an honest look at what lifestyle and diet changes are actually supported by evidence.
Why We Start Here
Every new glaucoma evaluation at Inland Glaucoma Center begins with a comprehensive medical history and a full medication review — not just an eye pressure check. This matters because several very common medications, prescribed for entirely unrelated reasons, can raise eye pressure or narrow the drainage angle, and because a handful of everyday habits have real, published evidence behind their effect on eye pressure. Understanding both gives us, and you, a more complete picture before deciding on drops, laser, or surgery.
Medication Review: What We're Looking For
A thorough medication history is one of the most useful, and most often overlooked, parts of a glaucoma evaluation. We ask about every route of exposure — pills, drops, inhalers, nasal sprays, creams, and injections — because several major medication classes have well-documented effects on eye pressure or angle anatomy.
- ✓Corticosteroids (any route) — eye drops, pills, inhalers, nasal sprays, skin creams, and joint or eye injections can all raise eye pressure in susceptible people. See our dedicated page on Steroid-Induced Glaucoma.
- ✓Calcium channel blockers — a common blood pressure medication class. Some studies have explored a possible association with open-angle glaucoma risk, though the evidence is mixed and not universally confirmed; this remains an area of ongoing research rather than an established cause-and-effect relationship.
- ✓Topiramate and other sulfa-based medications — can cause ciliary body swelling that pushes the iris forward and narrows the drainage angle, sometimes triggering acute angle closure within days to weeks of starting the medication.
- ✓Decongestants, antihistamines, and other pupil-dilating drugs — can precipitate an acute angle-closure attack, but only in eyes that already have an anatomically narrow drainage angle.
Why This Matters for Narrow Angles Specifically
If gonioscopy shows your drainage angle is anatomically narrow, certain medications carry a real risk of tipping that angle into an acute closure. We flag this clearly in your chart and discuss it with you directly, because this is exactly the kind of risk that can often be prevented with a simple conversation (or a prophylactic laser iridotomy) rather than discovered in an emergency room.
- Over-the-counter decongestants (e.g. pseudoephedrine, phenylephrine) and cold/allergy combination products
- Certain antihistamines with anticholinergic effects
- Some antidepressants and other psychiatric medications with pupil-dilating (anticholinergic) properties
- Topiramate and related sulfonamide-derivative medications
- Any medication or eye drop used specifically to dilate the pupil
None of this means these medications are unsafe for the general population — they are only a meaningful risk in eyes with anatomically narrow angles, which is one of several reasons we perform gonioscopy as part of a comprehensive glaucoma evaluation.
Exercise & Eye Pressure
Regular aerobic exercise (walking, jogging, cycling) has been shown in multiple studies to produce a modest, temporary lowering of eye pressure, and general cardiovascular fitness is a reasonable, low-risk habit to encourage in glaucoma patients.1 However, certain positions and exertion patterns can do the opposite: studies measuring eye pressure during common yoga poses found that head-down inversions (such as headstand and downward-facing dog) produced substantial, immediate increases in intraocular pressure, in some cases more than doubling baseline pressure while the position was held.2 Heavy resistance training performed with breath-holding (the Valsalva maneuver) has a similar transient pressure-raising effect. We generally recommend glaucoma patients avoid prolonged head-down positions and heavy straining with breath-holding, while continuing regular aerobic activity.
Sleep Position & Head-of-Bed Elevation
Lying flat, and particularly lying on one side with that eye against the pillow, has been shown to raise eye pressure in the dependent (downward) eye during sleep.3 A separate study found that sleeping with the head of the bed elevated about 20 degrees reduced the overnight eye-pressure rise compared to sleeping flat.4 For patients with asymmetric or progressive glaucoma, we sometimes discuss avoiding habitually sleeping on the affected side, and elevating the head of the bed, as simple, low-risk adjustments.
Diet: What the Evidence Actually Shows
A large prospective study following tens of thousands of health professionals found that people with a higher dietary intake of nitrate-rich leafy green vegetables (such as kale, spinach, and collard greens) had a meaningfully lower risk of developing primary open-angle glaucoma, particularly the form associated with early paracentral (central) visual field loss.5 This doesn't prove cause and effect, but it's one of the more consistent dietary associations identified in the glaucoma literature, and eating more leafy greens is a low-risk, generally healthy recommendation regardless.
Caffeine's effect is more nuanced: it can cause a small, transient rise in eye pressure after ingestion, but a large prospective cohort study found that habitual caffeine consumption was associated with increased glaucoma risk specifically among people who also had a family history of glaucoma, with no clear association in those without a family history.6 We don't routinely tell patients to eliminate coffee, but we do discuss moderation for patients with a strong family history or difficult-to-control pressure.
Alcohol produces a transient, modest lowering of eye pressure after ingestion, but this effect is short-lived and alcohol is not a treatment — and the general health risks of regular alcohol use outweigh any theoretical, temporary pressure benefit.
Supplements: A Realistic Look at the Evidence
A number of supplements are marketed for eye pressure or glaucoma support, but the evidence behind them is far less robust than for standard medical therapy. We review the most commonly asked-about options below so you can make an informed decision, ideally in conversation with us rather than on your own.
Ginkgo Biloba
A small crossover trial in patients with normal-tension glaucoma found that ginkgo biloba extract improved certain visual field indices compared to placebo, without a significant change in eye pressure itself.7 The study was small and short-term, so this should be considered preliminary evidence rather than a proven treatment, and ginkgo can interact with blood-thinning medications.
Omega-3 Fatty Acids
Some small studies suggest omega-3 fatty acids may influence ocular blood flow, but there is no conclusive evidence that omega-3 supplementation alters the course of glaucoma. They remain a reasonable general-health choice on their own merits.
Forskolin (Coleus forskohlii)
Both oral and topical forskolin preparations have been studied for modest intraocular pressure-lowering effects, but the effect size is small and inconsistent compared to standard prescription therapy, and forskolin is not a substitute for prescribed treatment.
Cannabis / Marijuana
THC can lower eye pressure for roughly 3–4 hours, but maintaining 24-hour control would require dosing around the clock, which carries significant systemic side effects (impaired cognition, cardiovascular effects, and more). The American Academy of Ophthalmology does not recommend cannabis as a glaucoma treatment.8
The bottom line: lifestyle and diet changes are a reasonable, low-risk complement to your glaucoma care — not a replacement for it. We're glad to discuss any specific habit, supplement, or medication you're curious about at your visit.
References
- Risner D, Ehrlich R, Kheradiya NS, et al. Effects of exercise on intraocular pressure and glaucoma. J Glaucoma. 2009;18(6):429-436.
- Baskaran M, Raman K, Ramani KK, et al. Effect of yoga on intraocular pressure and blood flow in the eyes. Br J Ophthalmol. Similar findings reported by Jasien JV, et al. Intraocular Pressure Rise in Subjects with and without Glaucoma During Four Common Yoga Positions. PLoS One. 2015;10(12):e0144505.
- Kim KN, Jeoung JW, Park KH, et al. Effect of lateral decubitus position on intraocular pressure in eyes with untreated open-angle glaucoma. Am J Ophthalmol. 2013.
- Buys YM, Alasbali T, Jin YP, et al. Effect of sleeping in a head-up position on intraocular pressure in patients with glaucoma. Ophthalmology. 2010;117(7):1348-1351.
- Kang JH, Willett WC, Rosner BA, et al. Association of Dietary Nitrate Intake With Primary Open-Angle Glaucoma: A Prospective Analysis From the Nurses' Health Study and Health Professionals Follow-up Study. JAMA Ophthalmol. 2016;134(3):294-303.
- Kang JH, Pasquale LR, Willett W, et al. Caffeine consumption and the risk of primary open-angle glaucoma: a prospective cohort study. Invest Ophthalmol Vis Sci. 2008;49(5):1924-1931.
- Quaranta L, Bettelli S, Uva MG, et al. Effect of Ginkgo biloba extract on pulsatile ocular blood flow in patients with normal-tension glaucoma. Ophthalmology. 2003;110(2):359-362.
- American Academy of Ophthalmology. Marijuana in the Treatment of Glaucoma (Clinical Statement).
Frequently Asked Questions
Can I treat glaucoma with diet and lifestyle alone?
No. Lifestyle and diet changes are a reasonable complement to standard care, but no diet, supplement, or lifestyle change has been shown to replace eye drops, laser, or surgery once glaucoma is diagnosed. We view these as supportive measures alongside, not instead of, proven medical treatment.
Should I stop my blood pressure or other medications?
No, not without talking to the prescribing doctor. We simply want a complete, current medication list at every visit, including calcium channel blockers, steroids of any kind, and anything with anticholinergic or decongestant effects, so we can factor it into your care and coordinate with your other physicians if needed.
Is coffee bad for glaucoma?
The evidence is mixed. Caffeine can cause a small, temporary rise in eye pressure, and one large prospective study linked heavier caffeine intake to increased glaucoma risk specifically in people with a family history of glaucoma, but there isn't strong evidence that moderate coffee drinking meaningfully worsens glaucoma in the general population.
Is marijuana a treatment for glaucoma?
No. While cannabis can lower eye pressure for a few hours, the effect is too short-lived to provide 24-hour control, and the American Academy of Ophthalmology does not recommend it as a glaucoma treatment given the systemic side effects and impracticality of dosing every few hours around the clock.
See a glaucoma specialist. Dr. Robert Gunzenhauser is Harvard-educated and UCLA fellowship-trained in glaucoma, providing expert diagnosis and treatment for Lifestyle, Diet & Medication Risk Review at Inland Glaucoma Center in Upland, CA.