Eyelashes protect the eyes from dust entering the eyeballs. New research has shown that among mammals, eyelashes have a specific length that protects the eyeballs without obscuring vision.

A team of scientists studied 22 animal species, from hedgehogs to giraffes, and compared their eyelashes. They found the perfect lash length was apparently a third of the width of the eye.

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Experiments reveal this length is the perfect length for eyelashes to effectively shield the eye without blocking too much light.

Eyelashes at a correct length are more effective in preventing dry eyes, reducing evaporation rates and dust deposits by 50 percent as opposed to those that are shorter or those that are longer.

Almost all mammals have eyelashes. Their function is yet to be determined, however. Theories about the function of eyelashes range from dust catchers; protecting the eyeball from falling particles and acting like whiskers or sensors that trigger a blinking response from stimuli.

For humans, scientists suggest the main function of lashes is to attract attention to the eyes and convey expression and communication.

In this new study, scientists used comparative anatomy, wind tunnel experiments and aerodynamic theory along with computer simulation to investigate the real role of eyelashes.

Results of the research and experiments show eyelashes are apparently filters not mainly intended to trap foreign particles but to redirect airflow. With the perfect width, which is a third of the width of the eye, eyelashes can function at their best.

According to David Hu from the Georgia Institute of Technology, the study demonstrates that eyelashes divert airflow as it functions as a passive dust controlling system for eyes.

Correct eyelash length reduce evaporation and particle deposition by 50 percent. The evolution of eyelashes lessens the frequency of endogenous blinks that also replenishes and cleans tear film.

This research can also lead to future eyelash inspired protection for optical sensors. This study was published in the Journal of the Royal Society Interface.

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