What purpose do tears serve in relation to pathogens?

Tears play a crucial role in the body's defense against pathogens, primarily serving as a cleaning mechanism. When we produce tears, they help to wash away foreign particles, debris, and microorganisms that may come into contact with the surface of the eye. This flushing action is essential for maintaining eye health and preventing infections caused by bacteria, viruses, and other harmful agents that could enter the eye and lead to disease.

By continuously lubricating the eye with tears, this fluid also creates a protective barrier against irritants and pathogens. In addition, tears contain enzymes and antimicrobial proteins, such as lysozyme, which actively combat and neutralize pathogens, further enhancing their cleaning role. While lubrication, hydration, and nutrition are important functions of tears, their primary significance in relation to pathogens is their ability to clean and protect the eye from potential infection.