What is the function of the meibomian gland?

The meibomian gland plays a crucial role in maintaining the health and function of the eyelid by secreting an oily substance known as meibum. This oil is essential for lubricating the margin of the eyelid and contributes to the formation of the tear film. By doing this, the meibomian gland helps prevent the evaporation of tears, thus ensuring that the eyes remain moist and protected against irritation.

While the other functions mentioned may relate to various aspects of ocular health, the specific function of the meibomian gland is centered around lubrication of the eyelid margin, making option B the most accurate choice. Its proper function is vital in avoiding dry eye symptoms and maintaining clear vision.