Meibomian glands

These glands are responsible for secreting oils that prevent the evaporation of the tear film on the eye's surface.

Meibomian glands, also known as tarsal glands, are modified sebaceous glands located in the eyelids. They produce meibum, an oily substance that contributes to the lipid layer of the tear film, helping to lubricate the eyes and maintain moisture. Each eyelid contains approximately 20 to 30 of these glands, which open along the inner edge of the eyelids.

Terminologia Anatomica

glandulae meibomianae

System

Integumentary system

Function

The primary function of Meibomian glands is to secrete meibum, which forms the outer lipid layer of the tear film. This lipid layer is crucial for preventing the rapid evaporation of tears, thus maintaining the eyes' surface moisture and providing a smooth optical surface for clear vision. Additionally, the oils produced by the Meibomian glands contribute to the overall health of the ocular surface, reducing friction during blinking and providing a barrier against environmental irritants. Dysfunction of these glands can lead to conditions such as dry eye syndrome or blepharitis, highlighting their essential role in ocular health and comfort.

Location

Meibomian glands are located within the tarsal plates of the upper and lower eyelids. These elongated glands are arranged vertically and can be found in both eyelids, approximately 1 to 2 millimeters from the margin of the eyelid. When the eyelids blink, the pressure exerted on these glands helps to express meibum onto the surface of the eye, ensuring a continuous supply of oils to the tear film. Their strategic location within the eyelids allows them to efficiently deliver lubrication every time the eyes are closed and opened.

Did You Know?

Meibomian gland dysfunction is a common cause of dry eyes, affecting millions of people worldwide.
The name 'Meibomian' comes from Heinrich Meibom, a German physician who studied the eyelid glands in the 17th century.
Each gland can produce up to 50 different types of lipids, which work together to create a stable tear film.