Yes, checking the meibomian glands is a routine and essential part of a dry eye assessment, as Meibomian Gland Dysfunction (MGD) is the leading cause of dry eye syndrome in the UK. Because most dry eye cases are ‘evaporative’ meaning the tears disappear too quickly rather than being underproduced eye specialists must examine these small oil glands in the eyelids to ensure they are providing the necessary seal to keep the eyes hydrated. Identifying gland blockages or changes in oil quality is the first step in moving beyond simple symptom relief toward treating the underlying cause of ocular discomfort.
What We’ll Discuss in This Article
- The clinical importance of the meibomian glands in tear film stability
- How specialists perform manual gland expression to check oil quality
- The role of slit-lamp biomicroscopy in identifying eyelid margin inflammation
- Advanced imaging techniques like meibography for assessing gland structure
- How meibomian gland health influences the choice of dry eye treatment
- Distinguishing between blocked glands and other forms of eyelid disease
The clinical role of the meibomian glands
Eye specialists check the meibomian glands because these glands are responsible for producing the ‘meibum’ (oil) that forms the outermost layer of the tear film. This lipid layer is vital for ocular comfort as it reduces the rate of tear evaporation and provides a smooth surface for the eyelid to glide over during a blink.
If these glands are not functioning correctly, the eye is prone to ‘evaporative dry eye’, where the watery tears are lost to the environment almost immediately. According to the College of Optometrists, Meibomian Gland Dysfunction is present in the vast majority of dry eye cases, making a detailed eyelid examination a priority during any clinical assessment. By checking these glands, the specialist can determine if the dryness is a result of poor oil quality or a physical blockage that needs to be cleared.
Manual gland expression and oil assessment
One of the most common ways a specialist checks gland function is through manual expression. Using a specialized tool or a sterile cotton swab, the specialist applies gentle pressure to the base of the eyelids while looking through a slit-lamp microscope. This allows them to see exactly what kind of oil is being produced by the glands.
In a healthy eye, the oil should be clear and have the consistency of thin olive oil. In cases of MGD, the specialist may observe:
- Cloudy or yellow oil: Indicates early stages of inflammation or infection.
- Thick, toothpaste-like oil: Suggests significant blockage and stagnation within the gland.
- No oil production: Indicates that the gland is either completely blocked or has begun to atrophy (shrink).
This test is essential for tailoring treatment; if the oil is thick, the specialist will focus on heat-based therapies to ‘melt’ the blockages and restore a healthy flow.
Eyelid margin and slit-lamp examination
Before expressing the glands, the specialist will use a slit-lamp biomicroscope to inspect the eyelid margins for signs of chronic inflammation, often associated with blepharitis. They look for ‘capping’, where the tiny openings of the meibomian glands are covered by a thin layer of skin or debris, and ‘telangiectasia’, which are small, red, dilated blood vessels along the lid edge.
These physical signs often correlate with the severity of the dry eye. For example, if the eyelid margins are red and thickened (tylosis), it suggests that the glands have been under stress for a long time. NICE clinical knowledge summaries highlight that the appearance of the eyelid margin is a key diagnostic indicator for both blepharitis and evaporative dry eye syndrome. This visual check helps the specialist understand the ‘environment’ in which the glands are trying to function.
Advanced imaging and meibography
In many advanced UK dry eye clinics, specialists use meibography to get a detailed look at the physical structure of the glands. This is a non-invasive imaging technique that uses infrared light to see through the eyelid tissue, producing a high-contrast image of the glands themselves.
Meibography is invaluable because it shows if any glands have been lost (gland dropout) or if they have become shortened or twisted (tortuosity). While manual expression tells the specialist about ‘function’ (how the glands are working today), meibography tells them about ‘structure’ (the long-term health and survival of the glands). This helps in setting realistic expectations for treatment; if a large percentage of glands have been lost, management will focus more on intensive lubrication and protecting the remaining glands.
Differentiating MGD from other conditions
Checking the meibomian glands also allows specialists to rule out other conditions that might mimic dry eye, such as ocular rosacea or simple allergic conjunctivitis. While an allergy might cause the eyes to be red and watery, it typically does not involve the thick, waxy gland secretions seen in MGD.
If the specialist finds that the glands are healthy, but the tear volume is still low, they know to look for ‘aqueous-deficient’ dry eye, which may be linked to systemic issues like Sjögren’s syndrome. The British Journal of Ophthalmology notes that a comprehensive assessment of both the lacrimal (water) and meibomian (oil) systems is required to accurately classify the type of dry eye and prescribe the correct anti-inflammatory or lubricant therapy. This ensures that a patient with blocked oil glands isn’t just given watery eye drops that fail to address the root cause.
Conclusion
Eye specialists routinely and thoroughly check the meibomian glands in dry eye cases because their function is critical to tear film stability. Through manual expression, slit-lamp examination, and advanced imaging like meibography, specialists can identify whether blockages or poor oil quality are causing your symptoms. This detailed check is essential for creating a management plan that effectively restores comfort and protects your ocular surface. If you experience severe, sudden, or worsening symptoms, call 999 immediately.
Does the specialist have to touch my eye to check the glands?
No; the specialist only needs to apply gentle pressure to the skin of your eyelids while you look in a different direction; they do not touch the eye surface itself.
Is meibomian gland expression painful?
It is generally described as a feeling of firm pressure rather than pain; most patients find it slightly unusual but not distressing.
Can I see the images of my oil glands?
Yes; if your specialist uses meibography, they will usually show you the infrared images so you can understand the health and structure of your eyelids.
Why does the specialist look at my eyelashes too?
They are looking for ‘collarettes’ or crusting, which are signs of blepharitis—a condition that very frequently causes meibomian gland problems.
How often should my glands be checked?
If you have chronic dry eye, your specialist will likely check your glands at every follow-up appointment to monitor how well your treatment is working.
Can blocked glands be fixed permanently?
While MGD is often a chronic condition, regular eyelid hygiene and professional expressions can keep the glands open and functioning well for most people.
Does makeup affect how the specialist checks my glands?
It can; it is best to attend a dry eye assessment without eye makeup so the specialist can clearly see the gland openings and the eyelid margins.
Authority Snapshot (E-E-A-T)
This article was created by the MyPatientAdvice Medical Content Team to explain the clinical importance of meibomian gland assessments. The information follows UK medical standards from the NHS, NICE, and the College of Optometrists. It has been reviewed by Dr. Stefan Petrov, a UK-trained physician with experience in general medicine and ophthalmology, ensuring that the diagnostic and physiological guidance is accurate and safe for patient education
