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In Vivo Confocal Microscopy in the Diagnosis and Management of Dry Eye: A Focus on Imaging Protocols and Interpretation
Published on: November 11, 2025
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Eyelashes divert airflow to protect the eye
Guillermo J Amador1, Wenbin Mao1, Peter DeMercurio1
1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
Journal of the Royal Society, Interface
|February 27, 2015
Summary
Eyelashes protect eyes by reducing airborne particle deposition and tear evaporation. This optimal eyelash length, about one-third of eye width, minimizes airflow stress on the ocular surface.
Area of Science:
- Aerodynamics
- Mammalian Biology
- Biophysics
Background:
- The precise function of eyelashes in mammals has remained largely unknown.
- Previous hypotheses on eyelash function lacked empirical evidence.
Purpose of the Study:
- To elucidate the aerodynamic functions of eyelashes.
- To determine the optimal eyelash length for ocular protection.
- To investigate the impact of eyelash length on airflow dynamics over the eye.
Main Methods:
- Conducted anatomical measurements across 22 mammalian species.
- Performed wind tunnel experiments to analyze airflow and particle deposition.
- Utilized scaling theory to model the interaction between eyelashes, airflow, and the ocular surface.
Main Results:
- Identified an optimal eyelash length approximately one-third of the eye width across studied species.
- Demonstrated that this optimal length reduces airborne particle deposition by 50%.
- Showed that optimal eyelash length decreases tear film evaporation by 50% and minimizes shear stress on the ocular surface.
Conclusions:
- Eyelashes serve a crucial aerodynamic function in protecting the eye.
- The optimal eyelash length balances airflow to minimize particle deposition and evaporation.
- Findings suggest potential applications in designing protective coverings for optical sensors.
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