What are meibomian glands?
A short, plain-language explanation of the tiny glands along your eyelids and the role they play in comfort.
- Author
- Dr. Bilal Ismail, OD
- Medically reviewed by
- Dr. Bilal Ismail, OD
- Published
- 2026-01-08
- Last reviewed
- 2026-01-08
Meibomian glands are small oil glands arranged in vertical rows within your upper and lower eyelids. There are roughly 25 to 40 in the upper lid and slightly fewer in the lower lid.
Each time you blink fully, these glands release a thin layer of oil onto the surface of the tear film.
Why the oil layer matters
That oil layer helps slow how quickly tears evaporate. When it is thinner or less consistent, the eye surface can feel dry, gritty, or tired — particularly late in the day.
Warmth and gentle lid hygiene are commonly discussed as ways to support this part of your routine.
References
- TFOS DEWS II Pathophysiology Report — Structure and function of the tear film lipid layer.
This article is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment.