Meibomian Gland Dysfunction (MGD)

Meibomian Gland Dysfunction (MGD), sometimes referred to as meibomian eye gland dysfunction, is one of the leading causes of dry eye syndrome, particularly evaporative dry eye. 

It occurs when the meibomian glands, the tiny oil-producing glands within your eyelids, become blocked or stop producing healthy oils. These oils form a protective layer over your tears. Without them, tears evaporate too quickly, leading to dryness, irritation and fluctuating vision. 

With early diagnosis and targeted treatment, MGD can be effectively managed to improve comfort and restore tear stability. 

What are the meibomian glands? 

The meibomian glands sit within the upper and lower eyelids. Each time you blink, they release a thin layer of oil (known as meibum) across the surface of your tears. 

This oil layer is essential because it: 

• Slows tear evaporation 
• Maintains tear stability 
• Supports clear, comfortable vision 

When these glands become blocked or produce poor-quality oil, the tear film becomes unstable. 

What is Meibomian Gland Dysfunction? 

Meibomian Gland Dysfunction (MGD) is a form of posterior blepharitis, meaning it affects the oil-producing glands within the eyelids rather than the skin around the lashes. 

There are two main ways gland function can become disrupted. The glands may produce less oil than they should, or oil may become trapped within the gland due to blockage. In many cases, the oil that is released is of poor quality, thicker, more sludgy and less effective at preventing tears from evaporating. 

When the glands are not working properly: 

• Oil flow becomes restricted 
• Tear stability is reduced 
• Tears evaporate more quickly 

This leads to evaporative dry eye, the most common form of dry eye disease. 

Unlike anterior blepharitis, which affects the lash line and skin around the eyelids, posterior blepharitis (MGD) primarily involves the glands within the lids themselves. 

What causes blocked meibomian glands? 

MGD can develop due to: 

• Age-related reduction in gland function 
• Hormonal changes, particularly during menopause 
• Reduced blinking (common with screen use) 
• Thickening of gland secretions over time 
• Inflammatory or autoimmune conditions 
• Certain medications 
• Wearing contact lenses 

Over time, untreated blockage can lead to structural gland changes and reduced oil production. 

Symptoms of Meibomian Gland Dysfunction 

Because MGD affects tear stability, symptoms are often linked to evaporation rather than surface inflammation. You may notice: 

• Dryness that worsens throughout the day 
• Fluctuating or blurred vision that improves when you blink 
• A sandy or gritty sensation 
• Sensitivity to air conditioning or heating 
• Eyes that feel tired during screen use 
• Excessive watering as the eyes try to compensate 

Symptoms often increase with prolonged reading or screen time, when blink rate reduces. 

The link between MGD and evaporative dry eye 

Healthy tears rely on three layers: oil, water and mucus. The oil layer prevents evaporation. When meibomian glands are not functioning properly: 

• Tears evaporate rapidly 
• The tear film breaks up too quickly 
• Vision becomes unstable 
• Ocular surface irritation increases 

This cycle can lead to chronic evaporative dry eye if not addressed. 

Treating MGD focuses on restoring oil flow and improving tear stability, rather than simply adding artificial tears. 

How is MGD diagnosed? 

MGD is diagnosed during a Dry Eye Assessment, which is separate from a routine eye test. During this dedicated consultation, your optometrist will assess: 

• Tear film stability 
• Eyelid margins 
• Meibomian gland structure and oil quality 
• Signs of ocular surface inflammation 

Using specialist equipment, we can determine whether MGD is contributing to your symptoms and create a personalised dry eye treatment plan. 

Book your dry eye test today. 

Treatment and management of MGD 

Meibomian Gland Dysfunction is highly manageable with the right approach. Treatment focuses on improving oil flow and restoring tear balance. Your personalised plan may include: 

• Warm compress therapy: Applying gentle heat to the eyelids once or twice daily helps soften thickened oils within the glands, encouraging healthier flow.  
• Eyelid massage and hygiene: After warming the lids, light massage towards the lash line can help release the oils naturally.  
• Lubricating eye drops: Lipid-based artificial tears can help stabilise the tear film, reduce evaporation and improve overall comfort. 
• Nutritional support: Omega-3 supplements, such as fish oil or flaxseed oil, may help improve the quality of the oils produced by the glands and support long-term tear stability. 

Advanced in-practice treatments 

While warm compresses and drops can help manage symptoms, they do not always fully clear blocked glands, particularly in moderate or more established MGD. 

When oil glands remain obstructed, the tear film cannot stabilise properly. This means evaporation continues, inflammation persists and symptoms return. 

In-practice treatment allows us to directly target the underlying gland dysfunction. 

• Meibomian Gland Expression gently clears blocked glands by releasing thickened oils. Restoring healthier oil flow helps strengthen the tear film and reduce evaporation, improving long-term comfort. 
• Intense Pulsed Light (IPL) uses controlled pulses of light to warm the eyelids, soften stagnant oils and reduce inflammation around the glands. Over time, this supports improved gland performance and tear stability. 
• Low-Level Light Therapy (LLLT) uses specific wavelengths of light to support eyelid health. Blue light helps reduce bacteria along the lid margins, while red light penetrates more deeply to stimulate the meibomian glands and encourage healthier oil production.
  
  By improving the quality and flow of oils within the tear film, LLLT helps reduce evaporation, calm irritation and support longer-term tear stability. 

• NuLids or BlephEx eyelid exfoliation removes debris and build-up along the lid margins that can obstruct gland openings. Keeping the gland entrances clear allows oils to flow more freely into the tear film. 
• BlefaCalm therapy combines therapeutic heat with gland support and gentle cleansing to improve oil quality, reduce irritation and restore overall eyelid balance. 

By addressing the root cause, rather than simply soothing the surface, these treatments help restore tear stability and provide longer-lasting relief. 

Your optometrist will only recommend in-practice treatment where it is clinically appropriate, as part of a personalised dry eye management plan. 

Expert advice and recommended products 

Some products you will recommend to our patients to help them with MGD. 

Consistent, targeted home care can make a meaningful difference in managing Meibomian Gland Dysfunction. 

Specialist heat masks, such as the Bruder mask, or precision heat devices like the Positive Impact Peep Wand, help warm the eyelids to soften thickened oils within the glands. Heat is one of the most effective first-line approaches for improving meibomian gland function and supporting healthier oil flow. 

We may also recommend gentle lid cleansing wipes to keep the gland openings clear, alongside lipid-based lubricating drops to protect the ocular surface and improve tear stability. 

Your optometrist will guide you on the most appropriate products for your individual needs as part of a personalised management plan. 

Visit your local branch. 

Preventing progression 

MGD often develops slowly over time. Early and consistent management can prevent symptoms from worsening. To support gland health: 

• Take regular screen breaks to maintain blink quality 
• Follow a consistent eyelid care routine 
• Stay hydrated 
• Consider dietary adjustments where appropriate 
• Attend regular eye examinations 

With structured care, many patients experience significant improvement in both comfort and visual clarity. 

When should you seek advice? 

Book a dry eye consultation if: 

• Your eyes feel dry, gritty or irritated despite using lubricating drops 
• Your symptoms worsen throughout the day, especially with screen use 
• Your eyelids feel tender along the lash line 
• You have been told you have blocked oil glands or evaporative dry eye 

Meibomian Gland Dysfunction often develops gradually, and early diagnosis allows us to restore healthier gland function before symptoms become more persistent. 

Conclusion 

Meibomian Gland Dysfunction is one of the most common, and most treatable, causes of dry eye. 

At Leightons, we provide detailed dry eye assessments to identify blocked oil glands and tailor treatment to your needs. If your eyes feel persistently dry, irritated or unstable, we are here to help. 

Book your dry eye assessment today and take the first step towards clearer, more comfortable vision.