What is the role of tears in the immune system?

Tears play a significant role in the immune system primarily by washing away organisms and foreign materials from the surface of the eyes. When we blink, the action of the eyelids spreads tears across the surface of the eyes, helping to flush out dust, debris, and potentially harmful pathogens. This mechanical process is essential for maintaining eye health and preventing infections, as it reduces the likelihood of microorganisms adhering to the ocular surface.

In addition to this physical cleansing action, tears contain antimicrobial substances, such as lysozyme and lactoferrin, which further contribute to the immune defense by breaking down bacterial cell walls and inhibiting the growth of pathogens. Hence, the function of tears in cleaning and protecting the eyes from infections underscores their vital role in the body's overall immune response.