Meibomian Gland Dysfunction: The Root Cause of Most Dry Eye

If you've been told you have dry eye and handed a bottle of artificial tears, there's a good chance the underlying cause was never properly identified. For the majority of dry eye patients — up to 86% according to research — the root cause is meibomian gland dysfunction (MGD). And artificial tears, while they provide temporary relief, do nothing to address MGD.

Understanding what MGD is and how it's treated is the first step toward actually getting better.

The meibomian glands are a row of specialized sebaceous glands embedded in the upper and lower eyelids. There are approximately 25–40 glands in the upper lid and 20–30 in the lower lid, running vertically from near the lash line to the inner edge of the eyelid.

Their function is to secrete meibum — a complex lipid (oil) mixture that forms the outermost layer of the tear film. This lipid layer serves a critical purpose: it slows the evaporation of the aqueous (watery) layer beneath it, keeping the tear film stable between blinks.

When the meibomian glands are healthy, they secrete clear, fluid meibum with each blink, continuously replenishing the lipid layer. When they're dysfunctional, the meibum becomes thickened and waxy, the gland openings become blocked, and the lipid layer thins — allowing tears to evaporate rapidly.

MGD is a chronic, diffuse abnormality of the meibomian glands characterized by terminal duct obstruction and qualitative or quantitative changes in glandular secretion. In plain language: the glands get clogged, their secretions change in character, and they gradually stop working properly.

MGD exists on a spectrum from mild (slightly thickened secretions, minimal symptoms) to severe (glands completely obstructed, significant gland atrophy, severe evaporative dry eye). Most patients present somewhere in the middle — symptomatic but with glands that still have functional capacity if treated appropriately.

MGD tends to progress if untreated. The sequence typically goes:

1. Hyperkeratinization: The cells lining the gland ducts begin to thicken, narrowing the duct opening
2. Obstruction: Thickened meibum accumulates behind the narrowed opening, eventually blocking it
3. Stasis: Stagnant meibum in the gland becomes increasingly inspissated (thickened and waxy)
4. Inflammation: Bacterial overgrowth on the stagnant meibum produces inflammatory byproducts that further damage the gland
5. Atrophy: Over time, the gland tissue itself begins to atrophy and drop out — permanent loss of gland function

This progression is why early treatment matters. Gland atrophy is irreversible. Treating MGD before significant atrophy occurs preserves gland function; treating it after extensive atrophy has occurred can only manage symptoms, not restore lost tissue.

MGD is extremely common — prevalence estimates range from 38% to 69% of the general population, with higher rates in older adults and in Asian populations. Several factors increase risk:

Age: MGD prevalence and severity increase with age. The glands naturally become less productive over time, and cumulative exposure to risk factors takes its toll.

Contact lens wear: Contact lenses alter the mechanical environment of the eyelid margin and can accelerate MGD. Long-term contact lens wearers have higher rates of meibomian gland atrophy.

Screen time: Reduced blink rate during screen use means the glands are expressed less frequently, allowing meibum to stagnate and thicken.

Skin conditions: Rosacea, seborrheic dermatitis, and psoriasis are all associated with MGD. The same inflammatory processes that affect skin affect the eyelid margin.

Hormonal changes: Androgens regulate meibomian gland function. Declining androgen levels — in both men and women — are associated with MGD. This is a significant factor in post-menopausal women.

Medications: Isotretinoin (Accutane), antihistamines, antidepressants, and some blood pressure medications can affect meibomian gland function.

Environment: Low humidity environments — like Las Vegas — accelerate tear evaporation and increase the demand on the meibomian glands.

Demodex infestation: Demodex folliculorum and Demodex brevis are microscopic mites that live in hair follicles and sebaceous glands. Overpopulation of Demodex on the eyelids causes a specific form of blepharitis (Demodex blepharitis) that is strongly associated with MGD.

The symptoms of MGD overlap significantly with other forms of dry eye:

• Burning, stinging, or gritty sensation
• Redness, particularly along the eyelid margins
• Fluctuating blurry vision that clears with blinking
• Excessive tearing (reflex tearing in response to ocular surface irritation)
• Crusting or debris along the eyelid margins, especially in the morning
• Eyelids that feel sticky or difficult to open in the morning
• Contact lens intolerance
• Sensitivity to wind, smoke, and air conditioning

Some patients with significant MGD have minimal symptoms — the condition can be more advanced than the symptom level suggests. This is why examination of the glands themselves is important, not just symptom assessment.

Proper MGD diagnosis requires examination of the eyelid margins and assessment of meibomian gland function and structure.

Slit lamp examination: The eyelid margins are examined under magnification for signs of MGD — plugging of gland orifices, vascular engorgement, irregular lid margin, and the quality of meibum expressed with gentle pressure.

Meibomian gland expression: Gentle pressure on the eyelid expresses meibum from the glands. Healthy glands produce clear, fluid oil. MGD glands produce cloudy, thickened, toothpaste-like secretions — or nothing at all if completely obstructed.

Meibography: Infrared imaging of the eyelids allows visualization of the meibomian gland structure. Healthy glands appear as long, parallel structures running the length of the lid. Atrophied or obstructed glands appear shortened, distorted, or absent. Meibography is the gold standard for assessing gland structure and tracking treatment response.

Tear film assessment: Tear break-up time (TBUT) measures how quickly the tear film breaks down between blinks. Short TBUT (under 10 seconds) indicates lipid layer instability consistent with MGD.

At Trendsetter Eyewear, our dry eye evaluation includes meibography and comprehensive meibomian gland assessment as standard components.

The goal of MGD treatment is to restore meibomian gland function — unclog the glands, improve the quality of meibum secretion, and reduce the inflammation that perpetuates the cycle of dysfunction.

The meibomian glands need to be warm enough for their secretions to flow. Applying heat to the eyelids softens inspissated meibum, making it expressible. This is the foundation of MGD treatment.

Warm compresses: The simplest intervention — a warm, moist cloth applied to closed eyelids for 10–15 minutes, followed by gentle lid massage. Effective for mild MGD but difficult to maintain consistently and often insufficient for moderate to severe disease.

In-office thermal pulsation: Devices like LipiFlow deliver precisely controlled heat to the inner eyelid surface while simultaneously applying pulsatile pressure to express the glands. More effective than warm compresses for moderate to severe MGD, with results lasting 9–12 months.

Radiofrequency energy heats the meibomian glands and periorbital tissue to therapeutic temperatures, liquefying blocked secretions and stimulating collagen production. RF treatment improves gland function and reduces the inflammation associated with MGD. At Trendsetter Eyewear's Dry Eye Spa, we offer OptiPlus RF as a primary MGD treatment.

IPL has become one of the most evidence-based treatments for evaporative dry eye and MGD. Light pulses target the abnormal blood vessels (telangiectasias) along the eyelid margins that produce inflammatory mediators, reducing the inflammatory load on the meibomian glands. IPL also has a direct thermal effect on the glands themselves.

Multiple studies show that IPL significantly improves meibomian gland function, tear film stability, and dry eye symptoms. A typical course involves 3–4 treatments spaced 3–4 weeks apart, with maintenance treatments every 6–12 months.

Keeping the eyelid margins clean is essential for MGD management. Biofilm, bacterial overgrowth, and Demodex infestation all contribute to MGD and must be addressed.

BlephEx: A professional eyelid cleaning treatment that uses a micro-rotating sponge to remove biofilm, bacterial exotoxins, and debris from the eyelid margins. More thorough than home lid scrubs.

Rinsada Eyelid Spa: A gentle, spa-like eyelid cleansing treatment available at our Dry Eye Spa.

Home lid hygiene: Daily cleaning with hypochlorous acid (HOCL) spray or tea tree oil-based lid scrubs (for Demodex) is an important component of ongoing MGD management.

If Demodex infestation is suspected, microbiome testing can confirm it. Treatment involves tea tree oil-based products (terpinen-4-ol) applied to the eyelid margins, and in some cases, prescription treatments.

Omega-3 fatty acids (EPA and DHA) support meibomian gland function by improving the fluidity of meibum secretions. High-quality omega-3 supplementation is a useful adjunct to other MGD treatments.

MGD is a chronic condition that requires ongoing management, not a one-time fix. The goals of treatment are to:

1. Restore as much gland function as possible
2. Prevent further gland atrophy
3. Maintain the improvements achieved with treatment

Most patients with moderate to severe MGD benefit from periodic in-office treatments (IPL, RF, or thermal pulsation) combined with consistent home care. The frequency of maintenance treatments depends on the severity of the condition and the individual patient's response.

If you have dry eye symptoms that haven't responded adequately to artificial tears, or if you've never had a proper dry eye evaluation, we'd encourage you to schedule an appointment. Understanding whether MGD is driving your symptoms — and how advanced it is — is the foundation of effective treatment.

Schedule a Dry Eye Evaluation at our Summerlin Dry Eye Spa. Dr. Payne will assess your meibomian glands thoroughly and recommend a treatment plan tailored to your specific situation.