Meibomian Gland Dysfunction: Causes, Symptoms and Treatment

Author: Dr Val Phua
Estimated reading time: 10–12 minutes

Your Eyes May Feel Dry Even When You Produce Plenty of Tears

Many patients with dry, burning or watery eyes assume that they are simply not producing enough tears.

However, one of the most common causes of dry eye is a problem with the tiny oil-producing glands within the eyelids. This condition is known as meibomian gland dysfunction, or MGD.

When the meibomian glands become blocked or produce poor-quality oil, the tears evaporate too quickly. The eyes may then feel dry, gritty, tired or uncomfortable—even when they are producing plenty of watery tears.

MGD is usually a chronic condition, but appropriate treatment can improve tear-film stability, relieve symptoms and help preserve the function of the remaining glands.

What Are the Meibomian Glands?

The meibomian glands are narrow oil-producing glands located inside the upper and lower eyelids.

Each time you blink, these glands release a substance called meibum onto the surface of the eye.

Meibum forms the oily outer layer of the tear film. Its main functions are to:

Slow tear evaporation
Keep the tear film stable between blinks
Lubricate the eyelids
Maintain a smooth optical surface
Reduce friction when blinking

Healthy meibum is generally clear and flows easily.

When the glands become dysfunctional, the oil may become thick, cloudy or difficult to express. Some glands may eventually shorten, distort or become less functional.

What Is Meibomian Gland Dysfunction?

Meibomian gland dysfunction is a chronic abnormality of the eyelid oil glands.

It most commonly involves:

Blockage of the gland openings
Thickening of the gland secretions
Reduced delivery of oil to the tear film
Changes in the quality of the oil
Inflammation around the eyelid margins
Structural loss of gland tissue in more advanced disease

Without an adequate oily layer, the watery tears evaporate rapidly. This produces evaporative dry eye disease.

MGD may occur by itself or together with aqueous-deficient dry eye, blepharitis, allergy or other ocular-surface conditions.

How Does MGD Cause Dry Eye?

A normal blink spreads tears and oil across the eye.

When the meibomian glands are blocked:

Less oil reaches the tear film.
The watery tears evaporate more rapidly.
The tear film breaks up between blinks.
The corneal surface becomes exposed and irritated.
Inflammation develops.
Inflammation further disrupts gland and tear-film function.

This creates a self-perpetuating cycle:

Blocked glands → poor oil layer → rapid evaporation → irritation and inflammation → further gland dysfunction

Breaking this cycle often requires consistent treatment rather than occasional eye drops alone.

What Does MGD Feel Like?

Symptoms vary considerably and may fluctuate from day to day.

Common symptoms include:

Burning or stinging
Grittiness or a sandy sensation
Tired or heavy eyes
Redness
Intermittent blurred vision
Vision that improves after blinking
Excessive watering
Sensitivity to light
Contact-lens discomfort
Eyelids that feel tender or sticky
Symptoms that worsen later in the day
Difficulty keeping the eyes open during prolonged screen use

Some patients have visible gland abnormalities without significant symptoms. Others experience considerable discomfort despite relatively mild clinical findings.

Why Does MGD Cause Fluctuating Vision?

The tear film forms the first optical surface that light passes through when entering the eye.

When the oily layer is inadequate, the tear film breaks up rapidly and the corneal surface becomes optically irregular.

Patients may notice:

Words becoming blurry while reading
Vision clearing briefly after blinking
Difficulty maintaining focus at a computer
Glare or halos at night
Variability during spectacle or cataract measurements

A stable tear film is therefore important not only for comfort but also for clear and consistent vision.

What Causes Meibomian Gland Dysfunction?

MGD usually results from several overlapping factors.

Ageing

Meibomian gland structure and function may decline with age.

Older adults are also more likely to have eyelid inflammation, hormonal changes, previous eye surgery or medication use that contributes to ocular-surface disease.

Reduced and Incomplete Blinking

Blinking helps pump oil from the meibomian glands.

During concentrated visual tasks, people blink less often and may not close their eyelids completely.

This is common during:

Computer work
Smartphone use
Gaming
Reading
Online meetings
Watching television

Incomplete blinking may allow the oil to remain trapped within the glands.

Prolonged Screen Use

Screen use contributes to MGD mainly through reduced and incomplete blinking rather than blue light exposure.

Symptoms may be particularly troublesome when prolonged screen use is combined with air conditioning or contact-lens wear.

Blepharitis

Blepharitis is inflammation of the eyelid margins.

It may lead to:

Red or thickened eyelid edges
Crusting around the lashes
Blocked gland openings
Recurrent styes
Burning or itching
Poor-quality meibum

MGD and blepharitis frequently occur together.

Rosacea

Rosacea can affect both the facial skin and the eyelids.

Ocular rosacea may cause:

Eyelid redness
Dilated blood vessels around the lid margins
Recurrent styes or chalazia
Thickened meibum
Chronic inflammation
Corneal involvement in more severe cases

Some patients have significant ocular rosacea even when facial symptoms are subtle.

Demodex

Demodex are microscopic mites that live around the eyelashes and eyelid glands.

Excessive infestation may contribute to eyelid inflammation, itching, lash debris and gland dysfunction.

Contact-Lens Wear

Contact lenses may increase tear evaporation and interact with the eyelids and tear film.

Discomfort is more likely when lenses are worn for long hours or combined with:

Heavy screen use
Air conditioning
Poor lens hygiene
Existing gland dysfunction
Infrequent lens replacement

Hormonal Influences

The meibomian glands are influenced by hormones, particularly androgens.

Hormonal changes associated with ageing, menopause and certain medications may affect oil production and gland function.

Medications

Medications that may contribute to gland dysfunction or dry eye include:

Isotretinoin
Some antihistamines
Certain antidepressants
Hormonal medications
Selected glaucoma eye drops
Other medications that reduce tear production

Do not stop prescribed medication without discussing it with your doctor.

Eye Surgery

Dry-eye symptoms and MGD may become more apparent after:

LASIK
SMILE
PRK
Cataract surgery
Eyelid surgery

Pre-existing gland dysfunction should ideally be identified and managed before elective eye surgery because an unstable tear film can affect comfort, recovery and the accuracy of preoperative measurements.

Environmental Exposure

MGD symptoms may worsen with:

Air conditioning
Low humidity
Wind
Fans directed at the face
Smoke
Haze
Air pollution

These factors increase tear evaporation even when the glands are only mildly dysfunctional.

Can the Meibomian Glands Become Permanently Damaged?

Yes.

Longstanding obstruction and inflammation may lead to:

Gland shortening
Distortion
Dilation
Loss or “dropout” of gland tissue

Once significant gland tissue has been lost, it may not fully regenerate.

Treatment therefore aims to:

Improve the function of remaining glands
Restore healthier oil flow
Reduce inflammation
Stabilise the tear film
Prevent or slow further deterioration

This is one reason why persistent symptoms should not simply be ignored.

How Is MGD Diagnosed?

MGD is diagnosed using a combination of symptoms and clinical findings.

No single test is sufficient for every patient.

Symptom History

Your ophthalmologist may ask:

When symptoms occur
Whether vision fluctuates
Whether symptoms worsen during screen use
Whether contact lenses are worn
Whether there is facial rosacea
Which medications and eye drops are being used
Whether previous eye surgery has been performed

Eyelid-Margin Examination

The gland openings are examined for:

Blockage
Thickening
Capping
Redness
Irregularity
Dilated blood vessels
Crusting or Demodex-related debris

Gland Expression

Gentle pressure may be applied to the eyelids to assess:

How easily oil is released
How many glands are functioning
Whether the oil is clear, cloudy, thick or toothpaste-like
Whether expression is uncomfortable

This provides functional information that imaging alone cannot provide.

Tear-Film Assessment

The tear film may be assessed for:

Rapid breakup
Reduced oily layer
Debris or foam
Increased evaporation
Areas of ocular-surface staining

Meibography

Meibography uses infrared imaging to show the structure of the glands within the eyelids.

It may reveal:

Gland shortening
Distortion
Dilation
Areas of gland loss
Differences between the upper and lower eyelids

Meibography is useful for documenting gland structure and discussing long-term risk. However, it should be interpreted together with symptoms, gland expression and tear-film findings.

Abnormal-looking glands do not always explain every symptom, and a normal image does not completely exclude functional disease.

Additional Tests

Selected patients may undergo:

Non-invasive tear-breakup testing
Lipid-layer assessment
Tear osmolarity testing
Ocular-surface staining
Blink analysis
Corneal topography
Tear-volume measurement

Not every patient requires all of these tests.

How Is Meibomian Gland Dysfunction Treated?

Treatment depends on:

The degree of gland obstruction
The quality of the oil
The amount of gland loss
Eyelid inflammation
Associated dry eye
Rosacea or Demodex
Symptom severity
Previous response to treatment

MGD treatment is usually stepwise and often requires long-term maintenance.

Warm Compresses

Warm compresses help soften thickened meibum so that it can flow more easily.

For a home compress to work effectively:

Use a clean compress designed to retain heat.
Apply it over the closed eyelids.
Keep it comfortably warm for approximately 5–10 minutes.
Reheat it if it cools too quickly.
Repeat consistently, usually once or twice daily when advised.

A cloth that becomes cold after a minute may not deliver sufficient sustained warmth.

The compress should never be hot enough to burn the eyelid skin.

Eyelid Massage

Gentle eyelid massage after warming may help move softened oil towards the gland openings.

Massage should be light and directed towards the eyelid margin:

Downwards for the upper eyelid
Upwards for the lower eyelid

Forceful squeezing may irritate the eye and is generally unnecessary.

Patients should follow the technique recommended by their eye-care professional.

Eyelid Hygiene

Cleaning the eyelid margins may help reduce debris, bacterial load and inflammation.

Options include:

Commercial eyelid wipes
Eyelid-cleansing solutions
Treatment directed at Demodex when present
Other clinician-recommended preparations

Eyelid hygiene should be gentle and should not involve harsh household soaps or chemicals.

Artificial Tears

Artificial tears do not unblock the meibomian glands, but they may reduce friction and improve comfort while the underlying gland problem is treated.

Lipid-containing artificial tears may be helpful for evaporative dry eye.

Preservative-free formulations are generally preferred when drops are required frequently.

Improve Blinking

During prolonged screen use:

Blink fully and deliberately.
Follow the 20-20-20 rule.
Take regular breaks.
Position the screen slightly below eye level.
Increase the font size rather than moving closer.
Avoid direct airflow towards the face.

Blinking exercises may be helpful for patients who habitually blink incompletely.

Treat Associated Blepharitis, Rosacea or Demodex

MGD may not improve adequately unless related eyelid disease is also controlled.

Treatment may include:

Targeted eyelid cleansing
Topical medications
Oral antibiotics in selected patients
Rosacea management
Demodex-specific treatment

Treatment should be individualised rather than using antibiotics routinely for every patient.

Prescription Anti-Inflammatory Treatment

Ocular-surface inflammation may persist even after gland obstruction improves.

Selected patients may benefit from:

Short courses of topical corticosteroids under supervision
Ciclosporin
Other anti-inflammatory or immunomodulating eye drops
Treatment directed at associated ocular-surface disease

These medicines should be prescribed and monitored by an eye-care professional.

Oral Medication

Low-dose oral tetracycline-class medication may be considered in selected patients with significant inflammatory MGD or ocular rosacea.

These medications may alter gland secretions and reduce inflammation.

They are not appropriate for everyone and may cause side effects. Pregnancy, allergies, age and interactions with other medication must be considered.

In-Clinic Gland Expression

An eye-care professional may manually express blocked glands after appropriate heating.

This can help release stagnant material, although it may be uncomfortable and does not replace ongoing home care.

The benefit varies according to disease severity and the amount of functioning gland tissue.

Thermal Pulsation

Thermal-pulsation systems apply controlled heat to the inner eyelid surface while using pressure or massage to clear gland obstruction.

Some patients experience improvement in gland function and symptoms following treatment.

However:

Results vary.
Treatment does not regenerate glands that have already been lost.
Benefits may not be permanent.
Maintenance therapy may still be required.
No single device is clearly superior for every patient.

Intense Pulsed Light

Intense pulsed light, or IPL, delivers controlled pulses of light to the skin around the eyelids.

Proposed effects include:

Reducing abnormal superficial blood vessels
Decreasing inflammatory signalling
Heating and softening meibum
Improving gland expression
Helping selected patients with rosacea-associated disease

Evidence suggests that IPL can improve symptoms and tear-film findings in selected patients with MGD, particularly when combined with gland expression.

It is not suitable for every skin type or clinical situation, and treatment should be performed using appropriate eye protection by a trained practitioner.

Other Procedures

Depending on the clinical findings, other options may include:

Alternative heat-and-expression systems
Low-level light therapy
Meibomian gland probing in selected cases
Treatment of incomplete eyelid closure
Scleral or specialised contact lenses for severe ocular-surface disease

The evidence and indications vary between procedures.

Do Omega-3 Supplements Help MGD?

Omega-3 supplements are frequently promoted for meibomian gland dysfunction.

Research results are mixed, and supplements should not be presented as a guaranteed treatment.

A balanced diet containing oily fish, nuts, seeds and other healthy fats supports general health. Patients taking anticoagulants or those with medical conditions should discuss supplements with their doctor.

How Long Does Treatment Take?

MGD is usually a chronic condition rather than a one-time blockage.

Some patients improve within weeks, while others require several months of consistent treatment.

The response depends on:

Duration of disease
Degree of obstruction
Amount of gland loss
Associated inflammation
Adherence to treatment
Environmental and lifestyle factors

Once symptoms improve, maintenance treatment is often needed to reduce recurrence.

Can MGD Be Cured?

MGD can usually be controlled, but it may not be permanently cured.

The gland openings may become blocked again if treatment stops, particularly when underlying risk factors remain.

The realistic goals are to:

Improve oil flow
Stabilise the tear film
Reduce discomfort
Preserve remaining gland function
Minimise flare-ups
Improve visual quality and contact-lens tolerance

How Can I Reduce the Risk of MGD Getting Worse?

Helpful habits include:

Taking regular screen breaks
Blinking fully
Managing blepharitis or rosacea
Limiting contact-lens wear when the eyes are irritated
Avoiding smoke and direct airflow
Removing eye makeup thoroughly
Replacing old cosmetic products
Following a consistent warm-compress routine when advised
Attending follow-up if symptoms persist

When Should I See an Eye Specialist?

Arrange an examination if:

Symptoms persist despite artificial tears
Vision frequently fluctuates
Warm compresses have not helped
Contact lenses are increasingly uncomfortable
You experience recurrent styes or chalazia
Eyelids remain red or tender
Symptoms affect work, reading or driving
You are considering cataract or refractive surgery

Warning Signs Requiring Prompt Assessment

MGD usually causes chronic irritation rather than severe pain or major visual loss.

Seek prompt care if you develop:

Severe eye pain
Sudden reduction in vision
Marked light sensitivity
Significant one-sided redness
A white spot on the cornea
Thick discharge
Eye injury or chemical exposure
A painful red eye while wearing contact lenses

These features may indicate an infection or another urgent condition rather than uncomplicated MGD.

Frequently Asked Questions

Is MGD the same as dry eye?

MGD is a major cause of evaporative dry eye, but dry eye can also result from inadequate watery tear production, inflammation, eyelid problems or nerve dysfunction.

Can artificial tears treat MGD?

Artificial tears relieve symptoms but do not usually clear blocked glands. They work best as part of a broader treatment plan.

Can blocked glands be reopened?

Some obstructed glands can release oil again after heating, expression and appropriate treatment. Glands that have undergone substantial structural loss may not fully recover.

Is MGD caused by bacteria?

Bacteria may contribute to eyelid inflammation and changes in gland secretions, but MGD is not simply a bacterial infection.

Is IPL better than thermal pulsation?

Both may help selected patients, but the best choice depends on gland structure, skin type, inflammation, rosacea, symptoms and previous treatment. Current evidence does not establish one procedure as universally best.

Can children or young adults develop MGD?

Yes. Screen use, incomplete blinking, contact lenses, acne treatments, rosacea and eyelid inflammation can contribute to MGD in younger patients.

Will warm compresses restore glands that have disappeared?

No. Warm compresses may improve oil flow from functioning glands but cannot reliably regenerate glands that have been lost.

The Bottom Line

Meibomian gland dysfunction occurs when the oil-producing glands within the eyelids become blocked, inflamed or structurally damaged.

Without sufficient healthy oil, tears evaporate quickly and the eyes become dry, irritated, watery or visually unstable.

Treatment may involve:

Warm compresses
Eyelid hygiene
Improved blinking
Artificial tears
Treatment of blepharitis, rosacea or Demodex
Prescription anti-inflammatory therapy
Gland expression
Thermal pulsation
IPL in selected patients

No single treatment is best for everyone.

A comprehensive dry-eye assessment helps determine whether the problem is primarily gland obstruction, inflammation, gland loss, reduced tear production or a combination of factors. Identifying the mechanism allows treatment to be more precisely targeted and gives the best chance of restoring comfort and stable vision.

References

Jones L, et al. TFOS DEWS III: Management and Therapy. American Journal of Ophthalmology. 2025.
Wolffsohn JS, et al. TFOS DEWS III: Diagnostic Methodology. American Journal of Ophthalmology. 2025.
Perez VL, et al. TFOS DEWS III Executive Summary. American Journal of Ophthalmology. 2025.
Nelson JD, et al. The International Workshop on Meibomian Gland Dysfunction: Report of the Definition and Classification Subcommittee. Investigative Ophthalmology & Visual Science. 2011.
Sabeti S, et al. Management of Meibomian Gland Dysfunction: A Review. Survey of Ophthalmology. 2020.
Pucker AD, et al. LipiFlow for the Treatment of Dry Eye Disease. Cochrane Database of Systematic Reviews. 2024.
Peira N, et al. Effectiveness and Safety of Intense Pulsed Light Therapy for Dry Eye Symptoms Due to Meibomian Gland Dysfunction: A Systematic Review. 2025.
American Academy of Ophthalmology. Dry Eye Syndrome Preferred Practice Pattern.