The ABCs of MGD
Excerpted from page 37 of the July/August 2018 edition of AOA Focus.
A 2016 online survey showed that only 30% of doctors of optometry were routinely expressing the Meibomian gland during comprehensive eye examinations.
AOA Focus asked Jillian Ziemanski, O.D., M.S., clinical assistant professor, University of Alabama at Birmingham School of Optometry, what doctors should know about meibomian gland dysfunction. Among Dr. Ziemanski's teaching and research interests are MGD, dry eye and Sjögren's syndrome.
Where are the meibomian glands located, and how do they contribute to eye health?
The meibomian glands are in the tarsal plate of the eyelids (both upper and lower). They are oriented vertically in the eyelids such that they open onto the surface of the lid margin. The primary function of the glands is to produce meibum, which is a mixture of mostly lipids and some proteins. The meibum is delivered to the eyelid margin and then spread across the surface of the eye upon blinking. Based on the polarity of aqueous tears and the mostly nonpolarity of the meibum, the lipids separate from the aqueous tears to form the outermost layer of the tears called the tear film lipid layer. The primary role of the lipid layer is to retard evaporation of the aqueous tears and promote tear stability.
What are the signs and symptoms of MGD?
Symptoms of MGD are very similar to dry eye disease (burning, irritation, grittiness, foreign body sensation, itchiness, fluctuating vision, etc.), given that MGD is the most prevalent etiology of dry eye disease. Signs of MGD will consist of general dry eye findings (punctate epitheliopathy of the cornea and/or conjunctiva, reduced tear break-up time, etc.). MGD-specific signs may include meibomian gland dropout (visualized by meibography or transillumination of the eyelids), poor quality of meibum (turbid/white or thick like toothpaste), reduced expression of meibum (low amount of meibum delivery to the ocular surface), posterior lid margin hyperemia and anterior displacement of the mucocutaneous junction.
Why is it so important to distinguish MGD from other types of dry eye?
It's important to understand the type of dry eye that each patient has so that treatment can be targeted to the underlying cause. Differentiating MGD from other types of dry eye really isn't all that difficult as long as you know what to look for.
How is MGD treated?
Treatment options include warm compresses, oral antibiotics (tetracyclines, macrolides), lipid-based artificial tears, in-office warming procedures, therapeutic gland expression and intense pulsed light.
How can MGD be prevented?
Warm compresses and lid hygiene may help to maintain the integrity and health of the glands/ocular surface. For those with frequent/prolonged computer or tablet use, incorporate deliberate blinking exercises (10 forceful blinks) at least every hour. The blinking promotes expression of meibum from the glands and may help to reduce stagnation. A 2016 online survey showed that only 30% of doctors of optometry were routinely expressing the Meibomian gland during comprehensive eye examinations. AOA Focus asked Jillian Ziemanski, O.D., M.S., clinical assistant professor, University of Alabama at Birmingham School of Optometry, what doctors should know about meibomian gland dysfunction. Among Dr. Ziemanski's teaching and research interests are MGD, dry eye and Sjögren's syndrome.
Where are the meibomian glands located, and how do they contribute to eye health?
The meibomian glands are in the tarsal plate of the eyelids (both upper and lower). They are oriented vertically in the eyelids such that they open onto the surface of the lid margin. The primary function of the glands is to produce meibum, which is a mixture of mostly lipids and some proteins. The meibum is delivered to the eyelid margin and then spread across the surface of the eye upon blinking. Based on the polarity of aqueous tears and the mostly nonpolarity of the meibum, the lipids separate from the aqueous tears to form the outermost layer of the tears called the tear film lipid layer. The primary role of the lipid layer is to retard evaporation of the aqueous tears and promote tear stability.
AOA series addresses concerns about myopia management
With the prevalence of myopia on the rise worldwide, an AOA webinar attempts to erase concern over barriers to providing myopia management. The webinar kicked off a three-event series focused on raising awareness of myopia management as a standard of care especially for children. Next is “Meet the Myopia Experts” on Saturday, June 24, at Optometry’s Meeting® 2023 in Washington, D.C.
AOA serving patients through research in optometry
For the fifth consecutive year, the AOA is sponsoring the Investigator Initiated Research Award. Investigators are invited to electronically submit proposals by July 1 for projects designed to increase knowledge through basic clinical and/or translational science relative to the continuum of eye and vision care. The AOA provides a maximum of $50,000 in direct costs for research conduct. Eric Ritchey, O.D., Ph.D., talks about his current research on low-level light therapy for patients with meibomian gland dysfunction, which can lead to dry eye disease.
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