Meibomian

Meibomian glands are the tiny oil glands which line the margin of the eyelids (the edges where the eyelashes are found). These glands secrete oil, which coats the surface of our eyes and keeps our tears from evaporating.

Anatomy

The Meibomian gland (also known as tarsal glands) are sebaceous glands that are arranged vertically within the tarsal plate of the upper and lower eyelids. The glands are not present at the inner canthus. The ducts of the meibomian glands open on the free margin of the lid at the posterior border of the lashes.

Function

The function of the meibomian glands is to secrete meibum, an oily substance that prevents evaporation of the eye's tear film. Meibum inhibits the tears from spilling onto the cheek, traps tears between the oiled edge and the eye, and makes the closed lids airtight.

Clinical significance

Dysfunction of the meibomian glands (MGD) can cause abnormal tear production, leading to dry eyes or excessive tearing. It can also cause blepharitis, a common eye disorder.

See also

• Blepharitis
• Dry eye syndrome
• Sebaceous gland

References

Meibomian Resources
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