Understanding and Managing Meibomian Gland Dysfunction
Dry, burning, watery or tired eyes are often caused by meibomian gland dysfunction (MGD), a problem with the oil glands in your eyelids. At Dr. Della Chow, we identify the cause and build a plan to relieve it.
The Oil Problem Behind Most Dry Eye: Meibomian Gland Dysfunction
Most people who come in describing dry eyes are not short of tears. They are short of oil. Their eyes water, sting by late afternoon, and go blurry on screens in a way that clears for a moment every time they blink — and drops from the pharmacy help for about twenty minutes.
That pattern points to meibomian gland dysfunction, the most common cause of dry eye disease and one of the most consistently missed. It is treatable, and it responds far better when it is caught early. Here is what the glands do, what goes wrong, and what actually helps.
TL;DR: Meibomian gland dysfunction is the most common cause of dry eye: the oil glands in your eyelids block, so tears evaporate too fast even though you make enough of them. It is treatable, and it responds far better when caught early.
What Are the Meibomian Glands?
Lined up vertically inside each eyelid, just behind the lashes, are roughly twenty-five to thirty narrow glands in the upper lid and slightly fewer in the lower. Every time you blink, they release a small amount of clear oil called meibum onto the edge of the lid.
That oil spreads across the surface of your tears and forms the outermost layer of the tear film. Its job is to stop the water underneath from evaporating between blinks. Without it, a perfectly adequate volume of tears disappears off the surface of the eye within seconds.
This is why oil matters more than volume. You can produce plenty of tears and still have a dry, irritated eye if the lid that holds them there is not doing its part.
What Is Meibomian Gland Dysfunction?
| Feature | Healthy Meibum | Blocked Meibum (MGD) |
|---|---|---|
| Appearance | Clear, thin, oil-like | Cloudy, thickened, toothpaste-like |
| Flow | Releases easily with every blink | Openings blocked, oil can’t reach the tear film |
| Result | Tears stay on the eye instead of evaporating | Burning, grittiness, watery eyes, blurred vision that clears with a blink |
What Are the Symptoms of MGD?
The symptom list overlaps heavily with general dry eye, with a few distinctive features:
Burning, grittiness, or a foreign-body sensation, typically worse as the day goes on
Watery eyes — counterintuitive, but a dry surface triggers a reflex flood of tears that lack the oil to stay put
Vision that blurs and clears with a blink, especially on screens
Red, thickened or crusty lid margins, sometimes with small bumps or capping along the lash line
Contact lenses that stopped being comfortable after years of being fine
Recurrent styes or chalazia, which often reflect chronically blocked glands
If your eyes water and you have been told you have dry eye, that is not a contradiction. It is one of the more reliable pointers toward an oil problem rather than a volume problem.
The same overlap causes confusion with allergies, since both can leave eyes watery, itchy and red — our guide to telling dry eye from allergies apart walks through how to tell them apart, and if blurring on screens is your main complaint, see can dry eye cause blurry vision for why that happens.
Why Does MGD Get Missed?
Dry eye is usually treated as a single condition, and the default response is artificial tears. If the underlying problem is evaporation, adding more water to a surface that cannot hold water gives an hour of relief and no progress.
MGD is also quiet early on. Glands can be substantially blocked, and in some cases already shortened or dropped out, before anyone notices a symptom. By the time the eye is genuinely uncomfortable, the process has usually been running for years.
And it requires looking specifically. The glands sit inside the lid, so assessing them means a close look at the lid margin at the slit lamp. A standard vision check does not do this unless someone thinks to.
What Causes Meibomian Gland Dysfunction?
Screens and how you blink
Focused screen work cuts blink rate dramatically, and a large share of the blinks that remain are incomplete — the lid never fully closes, so the lower glands are not compressed and their oil is not expressed. Glands that are not used regularly tend to block. For most people under fifty this is the single largest contributor.
Age and hormones
Gland function declines with age, and hormonal changes — particularly around menopause — alter the composition of the oil itself. This is why MGD becomes markedly more common after forty.
Rosacea and Demodex
Facial rosacea very often has an ocular counterpart affecting the lid margins, and it is strongly associated with MGD. Demodex mites, which live around the lash follicles, are another recognised driver, and both need treating in their own right for lid treatment to hold.
Contact lenses, environment and medication
Long-term lens wear is associated with gland changes. Dry indoor heating, air conditioning, and long flights all accelerate evaporation. Some medications — including isotretinoin, antihistamines and certain antidepressants — reduce oil production as a side effect. If contacts have become harder to tolerate, our guide to the best contact lenses for dry eyes covers what tends to help.
Vancouver’s damp climate is not the protection people assume it is, incidentally. Indoor heating for eight months of the year and screen-heavy work do more to the tear film than the weather outside does.
How Is MGD Diagnosed?
Assessment is quick and painless, and it goes beyond asking whether your eyes feel dry:
Lid margin examination at the slit lamp, looking at the gland openings for capping, blockage, redness and scarring
Tear break-up time, measuring how many seconds the tear film holds before it breaks
Surface staining with dye to reveal where the eye surface has been damaged
How Is MGD Treated?
At home
The foundation is heat, and technique matters more than effort. The oil needs to reach roughly 40°C to soften, and it needs to stay there — a facecloth loses its heat in under two minutes and does very little. A microwaveable eye mask held on for eight to ten minutes, daily, is the standard.
Immediately after heating, massage along the lid toward the lash line to move the softened oil out. Then clean the lid margin with a dedicated lid wipe or foam. Heat without expression accomplishes much less than the two together.
Alongside that: deliberate full blinks during screen work, regular breaks, and a humidifier if your indoor air is dry. Omega-3 supplementation is often suggested, though the trial evidence is genuinely mixed — worth discussing rather than assuming.
In practice
When home care is not enough, procedural options exist beyond it — thermal pulsing treatments, intense pulsed light therapy (particularly useful where rosacea is involved), and targeted treatment for Demodex. These aren’t services we provide in-clinic; in-clinic MGD care here is lid hygiene, warm compresses and drops. We assess your tear film and eyelids as part of a comprehensive exam, and if the glands need imaging or in-office treatment we arrange the referral to an ophthalmologist or specialty clinic.
Which of these is appropriate depends on how much gland function remains, which your referring specialist will assess.
Prescription
Chronic or inflammatory cases sometimes need prescription treatment — anti-inflammatory drops, or low-dose oral antibiotics used for their effect on oil composition rather than as an infection treatment. These are prescribed and monitored, not indefinite.
Whatever the route, MGD is managed rather than cured. Most people who improve do so because they kept up a five-minute daily routine, not because of any single treatment.
Why Treating It Early Matters
Blocked glands that stay blocked eventually shrink and drop out, and that loss does not come back. Everything above works by keeping the glands you have working — none of it regrows a gland that has already gone.
That is the argument for having your lids assessed while your symptoms are still mild or intermittent, rather than waiting until drops have stopped helping. It is also why we look at lid margins during a routine comprehensive eye exam rather than only when someone complains.
Stop Treating the Symptom
If artificial tears have become something you carry everywhere and reach for hourly, the issue is very likely not how many tears you make. It is whether they are staying where they should.
Book an assessment and we will examine your lid margins and check how quickly your tear film breaks down — then build a routine around what we actually find rather than a generic dry eye plan. As your neighbourhood optometrist in Kitsilano, we would rather look at your glands now than after they have thinned. “Book your eye exam in Vancouver today.
Medical disclaimer: This article is for general education and is not a substitute for an individualized eye exam. If you’re experiencing symptoms, please book an assessment so we can look at your specific situation.
Got Questions? We’ve Got Answers
What is the root cause of meibomian gland dysfunction?
The gland openings become obstructed and the oil inside thickens, so too little reaches the tear film and tears evaporate too fast. What drives that varies — reduced and incomplete blinking during screen work, age and hormonal change, rosacea, Demodex, contact lens wear, and some medications are the common contributors.
How can I fix meibomian gland dysfunction?
Daily sustained heat with a proper eye mask, followed by lid massage and lid margin cleaning. Where that is not enough, referral for procedures such as thermal pulsing or intense pulsed light can help, alongside prescription treatment where appropriate. MGD is managed rather than cured, so the daily routine is what maintains the result.
How long does it take for meibomian glands to unclog?
Most people notice some improvement within two to four weeks of daily treatment, and meaningful change by eight to twelve weeks. Longstanding blockage takes longer, and glands that have already atrophied will not recover.
Is MGD the same as dry eye?
Not quite — MGD is the most common cause of dry eye rather than a synonym for it. Dry eye describes the symptoms; MGD describes the oil failure behind the evaporative form of it.
Why do my eyes water if they are dry?
A dry, exposed surface triggers a reflex burst of tears. Those tears lack the oil layer that would keep them in place, so they evaporate or spill over rather than protecting the eye. Watery eyes are a common presentation of MGD.
Can an optometrist diagnose MGD?
Yes. It is diagnosed by examining the glands at the slit lamp and assessing tear film stability. Where imaging is needed, we arrange the referral.