What is the function of meibum?

What is the function of meibum?

• A. Nourish cornea
• B. Lubricate eyelids
• C. Prevent evaporation of tear film
• D. Fight infection

Answer: (C)

Meibum forms the lipid outer layer of the tear film, giving tears a hydrophobic coating. This lipid layer slows the evaporation of the aqueous tear film, helping to keep the tears stable between blinks and maintain a smooth, clear surface for vision. While other tear components nourish the cornea and provide lubrication, the primary function of meibum is evaporation prevention. It isn’t the main agent for fighting infection, though some minor antimicrobial properties may exist.

Meibum forms the lipid outer layer of the tear film, giving tears a hydrophobic coating. This lipid layer slows the evaporation of the aqueous tear film, helping to keep the tears stable between blinks and maintain a smooth, clear surface for vision. While other tear components nourish the cornea and provide lubrication, the primary function of meibum is evaporation prevention. It isn’t the main agent for fighting infection, though some minor antimicrobial properties may exist.