The mucin layer of the tear film primarily serves to:

The mucin layer of the tear film plays a crucial role in the overall health and function of the ocular surface by stabilizing the tear film, enhancing lubrication, and providing a protective barrier. Mucins are glycoproteins that contribute to the viscosity and surface tension of the tear film, ensuring even distribution across the ocular surface.

In relation to the mucin layer's function, it not only helps to adhere the tears to the cornea, but it also aids in forming a stable tear film that prevents evaporation by trapping moisture within the ocular surface. Additionally, this layer has antimicrobial properties that help protect against infections by providing a first line of defense against pathogens.

While protecting against infections is an important function of the mucin layer, its primary role is more focused on stabilizing the tear film and ensuring proper lubrication of the eye. This stabilizing effect is essential for maintaining a healthy ocular surface, supporting vision, and preventing dry eye symptoms. Thus, the mucin layer's primary function aligns more closely with stabilizing the tear film than with exclusively protecting against infections.