Omega-3 fatty acids — EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are anti-inflammatory, and help with Meibomian Gland dysfunction, and…
Tag: Dr Shibal Bhartiya dry eye treatment Gurgaon
Why Dry Eye Is Worse in Air Conditioning and on Flights
Air conditioning and airplane cabins have very low humidity, which speeds up tear evaporation and worsens dry eye disease. Reduced blinking during screen use or travel further destabilises the tear film, leading to irritation, watering, and fluctuating vision, Dr Shibal Bhartiya explains. This is Why Dry Eye Is Worse in Air Conditioning and on Flights
If your eyes feel fine at home but burn, itch, or blur the moment you step into an air-conditioned room, or within an hour of boarding a flight, you are not imagining it. The environment is doing something specific to your tear film, and understanding what it is doing makes it much easier to manage.
Dr Shibal Bhartiya is a fellowship-trained eye specialist and Mayo Clinic Research Collaborator with over 25 years of experience. Her approach focuses on identifying risk before damage is irreversible, simplifying treatment decisions, and protecting vision long-term. Emphasis on early detection, risk assessment, and continuity of care. She is rated 5 stars across 1,500+ patient reviews on Google.
Your Tear Film and the Air Around You
Your tears are not just water. They are a layered film, an oily outer layer produced by the meibomian glands, a watery middle layer, and a mucin layer that anchors everything to the eye surface. The oily layer is the one that matters most in environmental dry eye. It slows evaporation. When the air around you is dry, that oily layer is working harder than it should, and in many people, it is already not working well enough.
Humidity is the key variable. Healthy indoor humidity sits between 40 and 60 percent. A typical air-conditioned office or car runs at 20 to 30 percent. A long-haul aircraft cabin runs at 10 to 20 percent, drier than most deserts. At that level of ambient dryness, even a healthy tear film evaporates faster than the eye can replenish it. In someone with underlying meibomian gland dysfunction or borderline aqueous deficiency, it causes real surface damage within hours.
What Air Conditioning Does to Your Eyes
Air conditioning does three things that harm the tear film simultaneously.
It removes humidity from the air. The refrigeration cycle that cools the air also strips moisture from it. The cooler the room, the drier the air, and the faster your tears evaporate.
It creates directional airflow. Vents aimed at the face or dashboard vents in a car accelerate evaporation from the ocular surface dramatically. A ceiling vent in an office that circulates air across your field of vision does the same thing more slowly. You may not notice it, but your tear film does.
It reduces your blink rate indirectly. Air-conditioned environments are almost always screen environments, offices, cars, aircraft entertainment systems. Screen use reduces the blink rate from a normal 15 to 20 blinks per minute to as few as 5 to 7. Each blink spreads and renews the tear film. Half as many blinks means half as much renewal, while evaporation is already accelerated.
The result is a tear film that is thinner, less stable, and breaking up faster than it should. The eye surface becomes exposed between blinks. Symptoms follow: burning, grittiness, blurred vision that clears with blinking, and sensitivity to light.
Why Flights Are Particularly Harsh
Aircraft cabins are the most extreme low-humidity environment most people regularly encounter. Cabin humidity on long-haul flights typically stays between 10 and 20 percent throughout the journey. This is not a design flaw that airlines have failed to fix. It is a structural consequence of pressurising air at altitude, where the outside air contains almost no moisture.
Several things compound this on a flight. You are likely looking at a small screen for hours, which suppresses blinking. The overhead air nozzle, if open and directed at your face, creates a direct evaporative stream across your eyes. The cabin is cool. You may be mildly dehydrated from reduced fluid intake, alcohol, or caffeine. Each of these adds to the tear film burden individually. Together, they create conditions that would challenge even a healthy ocular surface.
Patients who have never noticed dry eye symptoms on the ground frequently experience significant discomfort on flights of more than three hours. Patients with known dry eye disease can find long-haul travel genuinely debilitating without preparation.
Before the Flight: What to Do
Preparation matters more than in-flight management. If you know you are sensitive to air conditioning or have been told you have dry eye, these steps reduce the impact significantly.
Start preservative-free drops the day before. Do not wait until your eyes are already symptomatic. Begin lubricating the surface before you expose it to the stress of the cabin environment.
Stay well hydrated in the 24 hours before travel. Systemic hydration does not directly replace tears, but dehydration reduces aqueous tear production. Arriving on a flight already mildly dehydrated, which most people do, starts you at a disadvantage.
Avoid antihistamines and decongestants if possible. Both reduce tear production. If you need them for travel, use preservative-free drops more frequently to compensate.
Pack preservative-free single-dose vials in your hand luggage. These are within the 100ml liquid allowance and are the most important thing you can carry for eye comfort on a long flight.
During the Flight
Close the overhead air nozzle, or redirect it away from your face. This single change reduces evaporative stress on the tear film more than any drop can compensate for.
Use preservative-free drops every one to two hours, whether or not your eyes are symptomatic. On a long-haul flight, waiting until you are uncomfortable means the surface has already deteriorated. Proactive lubrication maintains the film rather than rescuing it.
Blink deliberately and fully during screen use. Partial blinks, which are the norm during screen time, do not spread the tear film properly. A complete, deliberate blink every few minutes significantly improves tear distribution.
Wear glasses rather than contact lenses on long flights. Contact lenses absorb tear fluid and accelerate surface dehydration in low-humidity environments. If you must wear lenses, use lenses approved for dry conditions and apply lubricating drops approved for use with lenses.
Sleep with an eye mask. Closed eyes during sleep on a flight still lose moisture through the lids if the cabin is very dry. An eye mask reduces this. Patients with nocturnal lagophthalmos, incomplete lid closure during sleep, are particularly vulnerable.
At the Office: Managing Air Conditioning Daily
For patients who work long hours in air-conditioned offices, cumulative daily exposure is the problem. The symptoms may be less acute than on a flight, but the surface damage accumulates over months and years.
Reposition your screen below eye level. When you look slightly downward, your upper lid covers more of the eye surface. This reduces the exposed surface area and slows evaporation. A screen at eye level or above forces the eye wide open, the worst position for tear film stability.
Use a humidifier at your workstation. A small desktop humidifier can raise local humidity by 15 to 20 percent. This is not always practical in a shared office, but in a private workspace it is one of the most effective environmental interventions available.
Redirect or block air conditioning vents. Vent deflectors are inexpensive and widely available. Redirecting airflow away from your face and screen significantly reduces the evaporative load on your tear film.
Take structured screen breaks. Every 20 minutes, look at something 20 feet away for 20 seconds. This is not only about accommodation, the break also prompts a return to a normal blink rate and allows the tear film to redistribute.
When to Seek Assessment
Environmental management helps, but it has limits. If your eyes remain symptomatic despite preservative-free drops and environmental modifications, or if your symptoms are progressing: more frequent discomfort, longer recovery after exposure, increasing sensitivity to light. You need a proper dry eye assessment, not more drops.
A structured assessment will identify your tear film break-up time, your meibomian gland status, and the degree of surface damage. From there, treatment can be directed at the underlying cause rather than the symptom.
Dry eye triggered by environment is real dry eye. It deserves the same structured approach as any other presentation.
Clinical Reality (What’s not always obvious)
- Air-conditioned rooms and aircraft cabins don’t just feel dry—they actively accelerate tear evaporation, worsening dry eye disease even in people with mild or undiagnosed disease.
- Symptoms may be delayed—you might feel fine during the flight but develop burning, watering, or blur hours later.
- Reduced blinking (screens, movies, reading) compounds the problem more than the environment alone.
- Frequent fliers and office workers can develop chronic evaporative dry eye over time, not just temporary irritation.
- Simply using drops without addressing environment and habits often gives partial, short-lived relief.
What You Must Remember
| Factor | What It Means for You |
|---|---|
| Low humidity | Faster tear evaporation → increased dryness |
| Airflow (AC/vents) | Direct air exposure worsens surface irritation |
| Reduced blinking | Tear film breaks up faster during screens/reading |
| Flight environment | Very low cabin humidity → intense dryness |
| Common symptoms | Burning, watering, gritty feeling, fluctuating vision |
| Who is most affected | Frequent travellers, screen users, contact lens wearers |
| What helps immediately | Lubricating drops, conscious blinking, hydration |
| Environmental adjustments | Avoid direct airflow, use eye protection if needed |
| Long-term strategy | Treat underlying dry eye, not just episodic symptoms |
| Big picture | Environment + behaviour together drive symptoms—not one alone |
Frequently Asked Questions
Why do my eyes feel fine normally but burn in air conditioning?
Air conditioning lowers ambient humidity and creates directional airflow that accelerates tear evaporation. People with borderline meibomian gland function or mild aqueous deficiency often have enough tear film reserve for normal conditions but not for the additional evaporative stress of air-conditioned environments.
Can flying cause permanent dry eye?
A single flight does not cause permanent damage. Repeated long-haul travel without surface protection, over months and years, can accelerate underlying meibomian gland dysfunction and surface changes. Regular travellers with dry eye symptoms should have their meibomian gland status assessed.
Are eye drops allowed on a flight?
Yes. Eye drops in containers of 100ml or less are permitted in hand luggage within the standard liquid allowance. Preservative-free single-dose vials are the most practical format for travel. No contamination risk, no preservative toxicity, and no question about liquid volume.
Should I wear contact lenses on a long flight?
It is better to wear glasses on long-haul flights. Contact lenses absorb tear fluid and dry out faster in low-humidity cabin air. If you must wear lenses, use lubricating drops approved for use with contact lenses and remove lenses during sleep.
Does drinking water help dry eyes on a flight?
Systemic hydration supports aqueous tear production. Dehydration reduces it. Staying well hydrated during a flight, and avoiding alcohol and caffeine, which are dehydrating — is a useful supporting measure, though it does not replace topical lubrication.
What humidity level is best for eyes?
Between 40 and 60 percent relative humidity is the comfortable range for most people. Below 30 percent, typical of air-conditioned offices and vehicles, evaporation accelerates noticeably. Aircraft cabins at 10 to 20 percent are the most challenging environment for the tear film.
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, and Why Are Your Dry Eye Drops Not Working may also help you understand your problem better.
You may also want to read this article written by Dr Bhartiya for NDTV online. And listen to her talk about dry eyes here.
Read the research articles
This 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,. This article was edited in April 2026.
She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.
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.
Her work can be accessed on Pubmed, Google Scholar, ResearchGate and ORCID.
Dr Shibal Bhartiya
Glaucoma • Second Opinion • Advanced Care
www.drshibalbhartiya.com
+91 88826 38735
1500+ Five Star Patient Reviews Google Business Profile
Upload your reports for a structured review.
If you are unable to come to Dr Bhartiya’s clinic: Read more about teleconsultation
Why Your Eyes Water Constantly (And Why It May Actually Be Dry Eye Disease)
Watery eyes can still be caused by dry eye disease, when the tear film is unstable, the eye reflexively produces excess poor-quality tears. So constant watering isn’t always “too many tears,” but often a sign of underlying dryness and irritation, explains Dr Shibal Bhartiya.
It sounds like a contradiction. Your eyes water all day. Tears run down your face in the wind. You carry tissues everywhere. How could this possibly be dry eye?
It is one of the most common misdiagnoses in ophthalmology, and one of the most frustrating experiences for patients, who are told their eyes are dry while the evidence on their cheeks suggests otherwise. Understanding why this happens changes everything about how the condition is managed. Dr Shibal Bhartiya explains the science behind the paradox.
Dr Shibal Bhartiya is a fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator with over 25 years of experience. Her approach focuses on identifying risk before damage is irreversible, simplifying treatment decisions, and protecting vision long-term. Emphasis on early detection, risk assessment, and continuity of care. She is rated 5 stars across 1,500+ patient reviews on Google.
Two Different Tear Systems
Your eye produces two completely different kinds of tears, controlled by two different mechanisms. Most people do not know this. Most of the confusion about watery dry eye starts here.
Basal tears are the continuous, quiet tears that keep your eye surface lubricated at all times. They are produced steadily by the lacrimal gland and accessory glands, spread across the eye with every blink, and drain through the puncta, the small openings at the inner corner of each eyelid, into the nose. This is why your nose runs when you cry. Basal tears are thin, precisely layered, and rich in proteins, lipids, and mucins that nourish and protect the corneal surface.
Reflex tears are the emergency response. They are produced in large volume by the lacrimal gland when the eye surface is irritated, by wind, smoke, a foreign body, or a dry, damaged corneal surface. These tears are mostly water. They lack the lipid and mucin components that make basal tears stable. They flood the eye, overwhelm the drainage system, and run down the face.
Dry eye disease, in most cases, is a disease of basal tear quality, not quantity. When the basal tear film is unstable, the corneal surface becomes exposed and irritated. The eye responds by triggering the reflex tear system. The result is a flooded, watery eye that is simultaneously starved of the stable, nourishing tear film it actually needs.
Why the Tear Film Fails in the First Place
The tear film is a layered structure. The outermost layer is an oily film produced by the meibomian glands: roughly 25 to 30 tiny glands along the upper and lower eyelid margins. This oily layer sits on top of the watery layer and prevents evaporation. When it is present and healthy, tears stay on the eye surface for 10 seconds or more before breaking up.
When meibomian gland function is impaired: through age, hormonal changes, screen-related reduced blinking, skin conditions like rosacea (acne), or simply genetics, the oily layer becomes thin, irregular, or absent. Tears evaporate within seconds of each blink. The corneal surface becomes exposed. Nerve endings on the cornea, which are among the most sensitive in the body, fire. The reflex tear response is triggered.
This is evaporative dry eye, the most common subtype, accounting for the majority of dry eye disease. The lacrimal gland is perfectly capable of producing tears. The problem is that those tears cannot stay on the surface long enough to do their job.
The Paradox in Practice
Patients with evaporative dry eye and reflex tearing typically describe a very specific pattern:
Eyes that water in wind, cold air, or air conditioning: environments where evaporation is accelerated and the reflex response is constantly triggered.
Watery eyes when reading, using screens, or driving: tasks that reduce blink rate, accelerate tear film break-up, and expose the corneal surface.
Eyes that feel gritty, sandy, or burning despite the visible tearing: because the surface is genuinely dry between the floods of reflex tears.
Watering that improve temporarily after blinking hard or using a lubricating drop: because both actions briefly restore surface coverage.
Eyes that feel worse in the morning or after waking: because incomplete blinking during sleep allows the surface to dry and the morning blink triggers a surge of reflex tearing.
If this pattern sounds familiar, the diagnosis is almost certainly evaporative dry eye with reflex tearing- not excessive tear production, not a blocked tear duct, and not an allergy.
What Gets Missed, and Why It Matters
The two conditions most commonly confused with watery dry eye are blocked tear ducts and allergic conjunctivitis. Both cause watering. Neither is the same condition. Treating one when you have another delays recovery significantly.
Blocked tear ducts cause watering because tears cannot drain, not because too many are being produced. The eye surface is usually comfortable. The watering is present even at rest, not specifically triggered by wind or near work. A simple clinical test, syringing the punctum, confirms or excludes this within minutes.
Allergic conjunctivitis causes watering alongside itching, the cardinal symptom that distinguishes it from dry eye. Dry eye rarely causes significant itch. If your primary complaint is watering without itch, and your symptoms are worse in dry environments and with screen use, allergy is unlikely to be the primary driver.
Getting this distinction right matters because the treatments are entirely different. Antihistamine drops for dry eye provide no relief and may worsen it. Lubricating drops for a blocked duct do nothing for the drainage problem. And treating reflex tearing with drops alone, without addressing the underlying meibomian gland dysfunction, is managing the symptom while ignoring the disease.
The Right Assessment
A proper dry eye assessment for a patient with watery eyes should include:
Tear film break-up time — how long the tear film holds together between blinks. Under 10 seconds is abnormal. Under 5 seconds is severely abnormal and almost always associated with reflex tearing.
Meibomian gland evaluation — examining the gland orifices and the quality of the oil they express. Thickened, toothpaste-like secretions, or absent expression, confirm meibomian gland dysfunction as the driver. Your doctor may do a test called Meibography for detailed evaluation of your glands.
Corneal and conjunctival staining — fluorescein and lissamine green dyes reveal surface damage that is invisible to the naked eye. Staining in a watery eye confirms that the surface is genuinely dry despite the apparent flooding.
Punctal assessment — to exclude drainage obstruction as a contributing or primary cause.
This takes 15 to 20 minutes. It is the difference between a diagnosis and a guess.
Treatment: Addressing the Right Problem
Once evaporative dry eye with reflex tearing is confirmed, treatment is directed at restoring the oily tear layer. And not at reducing tear production or adding more water to the eye.
Warm compresses applied to the closed eyelids for 10 minutes daily soften the thickened meibomian gland secretions and improve oil flow. Consistency matters more than intensity, daily for weeks, not occasional and vigorous.
Lid hygiene, gentle cleaning of the eyelid margin, removes debris and bacterial biofilm that impair gland function. Specific lid scrubs or diluted baby shampoo on a clean cotton pad work well.
Lipid-containing artificial tears supplement the deficient oily layer between treatments. They do not replace meibomian gland function but reduce the evaporative stress on the surface while gland health is being restored.
Blinking exercises: deliberate, complete blinks every few minutes during screen use. These reduce the exposure time of the corneal surface and decrease the frequency of reflex tear triggering.
In more significant meibomian gland dysfunction, in-office treatments that apply heat and expression to the glands directly can restore function that warm compresses alone cannot achieve.
When to Seek Assessment
If your eyes water persistently and you have been told there is nothing wrong, or if treatment for allergy or blocked ducts has not helped, a dedicated dry eye assessment is the next step.
Watery eyes that are also uncomfortable, gritty, burning, light-sensitive, or blurring with screen use. They are almost never a simple overflow problem. They are a surface problem. And surface problems, addressed at the right level, respond well to treatment.
Clinical Reality (What’s not always obvious)
- Constant watering is often reflex tearing, not excess tears—triggered by surface irritation in dry eye disease.
- The tears produced are poor quality, so they don’t stay on the eye long enough to lubricate properly.
- Treating watering alone (wiping, anti-allergy drops) misses the root problem if dryness is driving it.
- Other causes like blocked tear ducts can coexist—so persistent symptoms need proper evaluation.
- More tearing does not mean the eye is healthy—it can be a sign of surface instability and chronic irritation.
What You Must Remember
| Aspect | What It Means for You |
|---|---|
| Main cause (common) | Dry eye → reflex tearing due to irritation |
| Type of tears | Excess but poor-quality, unstable tear film |
| Why it feels confusing | Watery eyes + dryness can happen together |
| Triggers | Wind, screen use, reading, AC environments |
| Associated symptoms | Burning, fluctuating vision, redness |
| Other causes to rule out | Blocked tear duct, infection, allergy |
| What helps | Lubrication, lid care, treating underlying dry eye |
| When to seek care | Persistent watering, discomfort, or vision fluctuation |
| Big picture | Watering is often a signal of imbalance, not excess tear health |
Frequently Asked Questions
Can dry eyes really cause watery eyes?
Yes. This is one of the most common presentations of dry eye disease. When the basal tear film is unstable and the corneal surface becomes exposed, the eye triggers a reflex tearing response. The result is excessive watering from a surface that is genuinely dry. Treating the dryness resolves the watering.
How do I know if my watery eyes are dry eye or a blocked tear duct?
Dry eye watering is triggered by specific conditions: wind, screens, dry environments, near work. It is accompanied by surface discomfort: grittiness, burning, or blurring. Blocked duct watering is present at rest, not specifically triggered, and usually comfortable. A simple clinical assessment distinguishes the two.
Why do my eyes water more in the wind?
Wind accelerates tear film evaporation dramatically. In someone with borderline or impaired meibomian gland function, even mild wind is enough to break down the tear film, expose the corneal surface, and trigger the reflex tear response. This is a classic presentation of evaporative dry eye.
Will antihistamine drops help watery dry eyes?
No. Antihistamine drops are for allergic watering, which is accompanied by itch. Dry eye watering is not allergic. Antihistamines also reduce basal tear production, which worsens the underlying dryness. They are the wrong treatment for this presentation.
Why are my eyes worse in the morning?
Incomplete blinking during sleep, and in some people, incomplete eyelid closure, allows the corneal surface to dry through the night. The morning blink triggers a surge of reflex tearing to rescue the exposed surface. Overnight lubricating gel or ointment, and assessment for nocturnal lagophthalmos, addresses this pattern.
Is there a cure for watery dry eye?
The condition is manageable rather than curable in most cases. With consistent meibomian gland treatment: warm compresses, lid hygiene, appropriate drops, and in-office therapy where indicated. Most patients achieve significant and sustained symptom reduction. The key is treating the right problem at the right level.
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, and Why Are Your Dry Eye Drops Not Working may also help you understand your problem better.
You may also want to read this article written by Dr Bhartiya for NDTV online. And listen to her talk about dry eyes here.
Read the research articles
This 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,. This article was edited in April 2026.
She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.
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.
Her work can be accessed on Pubmed, Google Scholar, ResearchGate and ORCID.
Dr Shibal Bhartiya
Glaucoma • Second Opinion • Advanced Care
www.drshibalbhartiya.com
+91 88826 38735
1500+ Five Star Patient Reviews Google Business Profile
Upload your reports for a structured review.
If you are unable to come to Dr Bhartiya’s clinic: Read more about teleconsultation