Quick Answer: Your glaucoma drops likely cause the burning, because the preservative benzalkonium chloride (BAK) damages your tear film. Treating both together, often with preservative-free drops, improves comfort, test accuracy and adherence.
Written by Dr Shibal Bhartiya, fellowship-trained glaucoma specialist. She trained in both cornea and glaucoma at AIIMS, New Delhi, for three years. Last reviewed: [date].
If your eyes burn, sting or feel gritty on glaucoma drops, you are not imagining it. This is common. Most patients assume it is part of the package, so they stay quiet.
Burning does not mean your glaucoma is getting worse. It usually means your ocular surface needs care. Do not stop or change your glaucoma drops without speaking to your doctor. Missed drops can let glaucoma progress without any symptoms.
Key Takeaways on Glaucoma and Dry Eyes
- Dry eye affects 40 to 60 percent of people on long-term glaucoma drops.
- Preservatives such as BAK often cause the burning.
- Dry eye can distort pressure readings, OCT scans and visual fields.
- Preservative-free drops, laser and surface care can restore comfort.
- Never stop your glaucoma drops without your doctor’s advice.
How Common Is Dry Eye in Glaucoma?
Studies show that 40 to 60 percent of glaucoma patients also have dry eye disease [1, 2]. The two conditions share risk factors, such as older age and menopause. They are still separate diseases.
Why Do Glaucoma Drops Cause Dry Eye?
1. The preservative (BAK)
Most glaucoma drops contain BAK. BAK keeps the bottle sterile. It also harms the surface of your eye [3].
BAK breaks up the tear film. It damages goblet cells, which make the mucus layer of your tears. It also triggers chronic inflammation.
Many patients use two or three drops a day. That means four to six BAK exposures daily, for years. The damage builds slowly. This is an expected effect of long-term BAK use. It is not rare.
2. Dry eye you already had
Older age, menopause and autoimmune disease raise the risk of dry eye. Many patients reach a glaucoma diagnosis with a weak surface already. Added BAK speeds up the damage.
3. Oil gland problems
Most dry eye in glaucoma patients is evaporative. The meibomian glands in your lid margins stop making enough good oil. Your tears then dry out too fast.
4. Screen time
You blink less on screens. Your tears evaporate faster, and drops sting more. Read more on why vision blurs after screen use.
What Does Your Symptom Mean?
| Symptom | Likely cause | When to worry |
|---|---|---|
| Burning or stinging right after a drop | BAK irritation on a dry surface | Redness, swelling or pain after every drop. This may signal an allergy to a drop. |
| Gritty, sandy feeling by evening | Evaporative dry eye, oil gland problems | Lubricating drops do not help. |
| Watery eyes | Irritated surface triggers reflex tearing | Tearing comes with discharge or a red, painful eye. |
| Blur that clears with blinking | Unstable tear film | Blur does not clear, or vision drops suddenly. |
| Dull ache, halos and redness | Not dry eye. Eye pressure may be rising. | Get care the same day. |
| You skip drops because they hurt | Drop discomfort | Tell your doctor now. Missed drops let glaucoma progress silently. |
Why Does the Glaucoma and Dry Eyes Overlap Matter?
- Adherence. Pain makes patients skip drops. Uncontrolled pressure then damages the optic nerve. Treating dry eye protects your drop routine.
- Test accuracy. An unstable tear film blurs visual field tests. It can create false dips that mimic progression. It can also lower OCT scan quality and make pressure readings less reliable.
- Surgery planning. Years of surface inflammation can leave the conjunctiva less healthy for filtering surgery.
- Quality of life. Chronic burning, light sensitivity and fluctuating vision are not inevitable. See more on quality of life in glaucoma.
How My Cornea and Glaucoma Superspeciality Training Affects my Clinical Decisions
I spent three years as a Senior Research Associate in the Cornea and Glaucoma Services at AIIMS, New Delhi. I managed complex tertiary referral patients with glaucoma and ocular surface disease.
That training changed how I see a glaucoma patient. I look at the surface first, not only the optic nerve. I count every drop, every bottle and every preservative. I ask whether you skip drops because they hurt.
Successful glaucoma care is not only about lowering eye pressure. It means protecting vision long-term while keeping the surface healthy enough to stay on treatment for life.
How Do I Assess This in the Clinic?
At my Gurgaon clinic, a glaucoma review for surface complaints includes:
- Tear breakup time (TBUT): It measures how fast your tear film breaks after a blink.
- Surface staining: Fluorescein and lissamine green dyes show damaged cells on the cornea and conjunctiva.
- Meibomian gland check: I look for blocked or weak oil glands.
- OSDI questionnaire: It captures symptoms the slit lamp cannot show.
- Drop review: I check which drops you use, how many, and how often.
What Are the Treatment Options?
1. Switch to preservative-free drops
This is often the most helpful step. Preservative-free drops lower pressure as well as preserved drops do. They skip the surface toxicity. Preservative-free options exist for prostaglandin analogues, beta-blockers, carbonic anhydrase inhibitors and some combinations. The TFOS DEWS II report on drug-induced dry eye supports this approach [4].
Availability and cost vary. Ask your specialist which options suit you. Read the complete guide to glaucoma eye drops.
2. Use fixed-dose combination drops
One bottle with two medicines means fewer drops and fewer preservative exposures. For many patients, this is a practical first step.
3. Treat the dry eye directly
- Artificial tears: Choose preservative-free tears. Use them regularly through the day.
- Warm compresses and lid hygiene: They improve the quality of your oil layer.
- Omega-3: Read the evidence on omega-3 and dry eye.
- Anti-inflammatory drops: Topical cyclosporine, or lifitegrast where available, calms the inflammation that keeps dry eye going.
- Punctal plugs: Tiny plugs keep your natural tears on the eye longer.
4. Use laser or surgery to cut your drop load
Some patients can reduce or stop drops. Selective laser trabeculoplasty (SLT) lowers pressure without drops. For advanced disease, minimally invasive glaucoma surgery (MIGS) or trabeculectomy can cut drop burden. See also laser to avoid eye drops.
What Doctors Often Miss
- Irritation gets blamed on glaucoma progression. More often, it comes from the surface.
- Tests run through a dry surface. A visual field done through an unstable tear film is not a trustworthy test. I prefer to stabilise the surface first, or treat both together.
- Nobody adds up the total BAK load across all your bottles.
- Nobody asks about skipped drops. Patients rarely volunteer it.
Can Dry Eye Cause Glaucoma?
No. Dry eye does not cause glaucoma. The two diseases have different mechanisms. Both become more common with age, and chronic inflammation may play a role in each. Researchers are still studying that link.
A Warning About Steroid Eye Drops
In India, pharmacies sometimes sell steroid eye drops without a prescription. They ease redness and irritation fast, so patients keep using them.
Long-term, unsupervised steroid drops can raise eye pressure and cause steroid-induced glaucoma. This can permanently damage the optic nerve. Steroids also speed up cataracts and raise infection risk.
Never use steroid drops for persistent dry eye without an ophthalmologist’s advice.
When to See a Doctor
See a Doctor Urgently (Same Day)
- Sudden loss or drop in vision
- Severe eye pain, especially with redness, halos or nausea
- A white spot on the cornea, or pus, especially in contact lens wearers
- Chemical splash or eye injury
- Severe light sensitivity with a red, painful eye
See a Doctor (Book a Visit)
- Burning or grittiness that lasts more than a few days on your drops
- You skip or shorten your drops because they hurt
- You use two or more glaucoma drops
- You need lubricating drops many times a day
- Your visual field or OCT results vary from visit to visit
- You use steroid drops without advice
What This Means for You
Burning on glaucoma drops is common, and you can fix it. Do not accept it as normal. Do not stop your drops on your own.
Tell your doctor:
- Which symptoms bother you most (burning, grittiness, blur, light sensitivity)
- Whether symptoms get worse after drops or at certain times of day
- Whether you have ever skipped or reduced drops because of discomfort
- How many hours a day you spend on screens
This does not make you a difficult patient. It makes your care more precise.
Frequently Asked Questions
Can glaucoma drops cause dry eye?
Yes. Most glaucoma drops contain BAK. Over time, BAK causes inflammation, goblet cell loss and dry eye. Preservative-free drops often bring relief.
Can I use artificial tears with my glaucoma drops?
Yes, and many patients should. Wait at least five minutes between different drops, so one does not wash out the other. Ask your doctor to confirm the best order for your drops.
Are preservative-free glaucoma drops as effective?
Yes. The active medicine is the same. The preservative only keeps a multi-dose bottle sterile. Preservative-free drops come in single-dose units.
Can dry eye affect my glaucoma test results?
Yes. An unstable tear film can distort pressure readings, OCT scans and visual fields. That is why I assess the ocular surface in glaucoma care.
Can I use laser if my eyes cannot tolerate drops?
Often, yes. SLT can lower pressure and reduce your need for drops. If drop toxicity is severe, your doctor may also discuss surgery.
Book a Consultation
Burning, irritation or fluctuating vision on glaucoma treatment has options beyond more lubricating drops. A full assessment can tell whether you have dry eye, preservative toxicity, oil gland dysfunction or another surface problem. Then I tailor treatment to your glaucoma and your comfort.
Whether you need a second opinion, have drops that no longer feel comfortable, or want to explore preservative-free drops, laser or surgery, I can help.
Book an Appointment:
📍 Gurgaon 📞 +91 88826 38735 | 🌐 Contact Us | Second Opinion Form for teleconsults
Glaucoma (L.I.F.T.S.™): L.I.F.T.S.™ checks records over time, re-confirms the diagnosis, measures progression speed, sets target pressure, then recommends observe, refine or escalate.
Dry eye (C.L.E.A.R.™): C.L.E.A.R.™ finds your dry eye subtype, maps oil glands, audits drops and medicines, measures inflammation, then builds a root-cause plan.
This page is a part of the Glaucoma Hub. you may want to read about Glaucoma Progression, , and Risk Stratification in Glaucoma. Other articles of interest could be Advanced Glaucoma Care in Gurgaon, What Good Glaucoma Care Actually Optimises For, What Happens If Glaucoma Is Left Untreated?, More Glaucoma Eye Drops is Not Better Glaucoma Care, 5 Mistakes Patients Make in Glaucoma Care and Do You Really Need Treatment for Glaucoma?
This article is part of the Dry Eye Hub. Please also read Basics of Dry Eye, Dry Eye Second Opinion and Dry Eye: A Chronic Disease. Why Vision Becomes Blurred After Reading or Screen Use, Why Dry Eye Symptoms and Tests Don’t Match, and Why Are Your Dry Eye Drops Not Working may also help you understand your problem better.
You may want to read How to remember your glaucoma medication, Tips and tricks on how to use your eye drops, Whether refrigerating eye drops helps, How to manage side effects of glaucoma drops, Why my dry eye drops are not working, How to reduce glaucoma drops, Glaucoma drops not working, and Glaucoma progressing despite eye drops.
You may also want to learn how to put eyedrops here.
About the Author
TThis article was written by Dr Shibal Bhartiya, fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator, Clinical Director at Marengo Asia Hospitals, Gurugram, known for ethical, patient-centred glaucoma care and independent glaucoma second opinions. She is also the Program Director for Community Outreach & Wellness; and for the Marengo Asia International Institute of Neuro and Spine.
Dr Bhartiya has published peer-reviewed research onglaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes. She is also a committed patient advocate and mainstream medical columnist, translating complex ophthalmic evidence into actionable public health insights across leading national platforms including NDTV and OnlyMyHealth
As Editor-in-Chief of Clinical and Experimental Vision and Eye Research and Executive Editor of the Journal of Current Glaucoma Practice (Pubmed Indexed, official journal of the International Society of Glaucoma Surgery), Dr Shibal Bhartiya brings editorial and research depth to every clinical decision. Her 200+ publications, including 90+ PubMed-indexed publications and 28 edited textbooks span glaucoma biology, surgical outcomes, health equity, and emerging diagnostics.
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Last Reviewed: October 2026
Read More
Basics of Dry Eye, Dry Eye Second Opinion, Dry Eye: A Chronic Disease
Why Do Women Get Dry Eye More Often? Menopause and Dry Eye
Dry Eyes: Natural Remedies, Dry Eyes: Tips to Soothe Sore Eyes
Why Dry Eye Is Worse in Air Conditioning and on Flights
Screen Fatigue, Why Vision Becomes Blurred After Reading or Screen Use,
Why Your Eyes Water Constantly, Omega-3 and Dry Eye, Why Are Your Dry Eye Drops Not Working
Glaucoma Eye Drops: The Complete Guide, Laser or Eye Drops for Glaucoma
Managing Glaucoma Eye Drop Side Effects, Which Is the Best Eyedrop for Glaucoma?