How is meibomian gland dysfunction different from dry eye?

MGD is a specific cause of dry eye—the leading cause of the evaporative subtype. It refers to dysfunction of the eyelid oil glands, whereas dry eye disease is the broader ocular surface condition that MGD frequently produces.

What does meibography show?

Meibography images the structure of the meibomian glands within the eyelids, revealing gland shortening, distortion, and dropout, which helps establish prognosis and guide treatment intensity.

Are in-office treatments for MGD necessary?

Many patients improve with consistent at-home lid warming and hygiene, but in-office thermal pulsation, gland expression, or intense pulsed light are valuable for moderate to severe or refractory disease.

Cornea & Ocular SurfaceOphthalmologyOptometry

Meibomian Gland Dysfunction

Also known as: MGD, Posterior blepharitis, Lipid deficiency dry eye

Overview

Meibomian gland dysfunction (MGD) is a chronic, diffuse abnormality of the meibomian glands, commonly characterized by terminal duct obstruction and changes in glandular secretion, and it is the leading cause of evaporative dry eye disease. Because the meibomian glands supply the lipid layer that stabilizes the tear film, their dysfunction leads to accelerated evaporation, instability, and ocular surface inflammation.

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Affected structure: Meibomian (lipid) glands
Consequence: Evaporative dry eye
Key imaging: Meibography
In-office therapy: Thermal pulsation, IPL

Key clinical points

MGD is the most common cause of dry eye disease.
Gland obstruction and abnormal meibum quality reduce tear film lipid, accelerating evaporation.
Meibography reveals gland dropout and guides prognosis and counseling.
Treatment combines at-home lid warming with in-office thermal and light-based procedures.
Early intervention aims to preserve remaining functional glands.

Pathophysiology

The meibomian glands secrete meibum, the lipid layer that slows tear evaporation. In MGD, terminal duct obstruction and altered secretion reduce the quantity and quality of this lipid. The result is a less stable tear film, increased evaporation, hyperosmolarity, and inflammation—the core drivers of evaporative dry eye.

Chronic obstruction can lead to gland atrophy and permanent dropout, underscoring the value of early recognition.

Evaluation

Examination assesses lid margin architecture, gland orifice capping, and the expressibility and quality of meibum. Meibography images gland structure and quantifies dropout, which informs prognosis. Tear breakup time and osmolarity characterize the associated evaporative component and inflammation.

Management

At-home therapy includes consistent warm compresses, lid hygiene, and, in many patients, omega-3 support. In-office procedures—automated thermal pulsation, meibomian gland expression, and intense pulsed light—liquefy and clear inspissated meibum and reduce periocular inflammation.

Adjuncts include topical anti-inflammatories for the associated dry eye and treatment of coexisting blepharitis and rosacea. Management is ongoing, and setting expectations for maintenance therapy improves adherence.

Frequently asked questions

How is meibomian gland dysfunction different from dry eye?: MGD is a specific cause of dry eye—the leading cause of the evaporative subtype. It refers to dysfunction of the eyelid oil glands, whereas dry eye disease is the broader ocular surface condition that MGD frequently produces.
What does meibography show?: Meibography images the structure of the meibomian glands within the eyelids, revealing gland shortening, distortion, and dropout, which helps establish prognosis and guide treatment intensity.
Are in-office treatments for MGD necessary?: Many patients improve with consistent at-home lid warming and hygiene, but in-office thermal pulsation, gland expression, or intense pulsed light are valuable for moderate to severe or refractory disease.

References & further reading

Cornea & Ocular Surface

Dry Eye Disease

Dry eye disease is a multifactorial disease of the ocular surface characterized by loss of tear film homeostasis, accompanied by ocular symptoms, in which tear film instability, hyperosmolarity, inflammation, and neurosensory abnormalities play etiological roles. It is among the most common reasons patients present to eyecare providers. Management is staged and targets the underlying subtype—aqueous-deficient, evaporative, or mixed.

Clinical overview Cornea & Ocular Surface

Blepharitis

Blepharitis is a common, chronic inflammation of the eyelid margins that contributes substantially to ocular surface disease and dry eye. It is broadly divided into anterior blepharitis, affecting the lash base, and posterior blepharitis, involving the meibomian glands. Management centers on consistent lid hygiene and targeting the underlying inflammatory or infectious contributors.

Clinical overview