What function do eyelashes serve?

Eyelashes play a crucial role in protecting the eyes. They serve as a first line of defense against foreign particles, such as dust, dirt, and insects, that could potentially irritate or harm the eyes. When an external object approaches the eye, the eyelashes trigger a blink reflex, which helps to sweep away debris and prevent it from entering the eye. This protective function is essential for maintaining eye health and comfort.

While enhancing the beauty of the eyes and providing shade may contribute to the aesthetic appeal and comfort, they are not primary biological functions. The role of acting as a barrier for sunlight is less significant compared to their protective capabilities, as the eyelid and other structures have a more substantial role in blocking an excessive amount of light. Therefore, the primary function of eyelashes is indeed to protect the eyes by sweeping away debris.