Eyelash Physiology and Extensions

A photograph of a pair of false eyelashes with long lashes

I must  confess I do not read the Journal of the Royal Society Interface regularly, but luckily, the ECONOMIST devoted two thirds of a page to describing how eyelashes work. Eyelashes were last discussed in this blog on Oct 29, 2013, showing a dogged  persistence and perseveration about this skin appendage, which is often relegated solely  to the cosmetic domain.

The basic finding in the study is that the average length of the eye lashes is about one  third of the eye’s width in the 22 animal species studied. Seeing a constant mathematical relationship set the boffins to deriving mathematical and physical models to explain the basis for it.  Most believe that dust, and other physical matter gets stuck on the cilia, but there is a new  and deeper interpretation from these new studies. Eyelashes control the flow of air to and around the cornea so that the water in the corneal  film does not evaporate excessively. The ever-imaginative  authors built wind tunnels to test these functions and to derive differential equations to describe their results.  Question for those of us who don’t do advanced math: if eyelashes are longer and wider owing to drugs, or if  eyelash extenders  are applied, will this alter the physiological water balance between the tear film and the cornea? (When you charge eyelash extensions to your research grant funds, please have an excellent justification.


Amador, GJ Eyelids divert airflow to protect the eye  J Royal Soc Interface  DOI 10.1098/rsif.2014.1294   published 26 February 2015.

6 thoughts on “Eyelash Physiology and Extensions

  1. Soy de Perú tengo una hija de 19 años con Alopecia Universal! Quiero inscribirme con mi esposo para la conferencia del 15 de mayo en Atlanta! Estoy muy interesada! Necesito urgente información! Tengo un hermano, Dentista, que vive en Mildfort a pocos minutos de la universidad de Yale! Por favor, atiendan mi pedido. Espero pronta información!


    1. Hi Elizabeth,
      Thank you for your post. It would be really beneficial for your daughter to attend the 30th Annual National Alopecia Areata International Patient Conference, will take place Thursday, June 25 – Sunday, June 28, in Garden Grove, California. She will meet other young adults with alopecia areata and know she is not alone. You will be able to listen to the leading medical researchers and ask questions of them. For more information, please visit https://www.naaf.org/programs/annual-patient-conference or feel free to contact us at info@naaf.org.


  2. We have noted your comment and forwarded it to the National Alopecia Areata Foundation. NAAF supports research to find a cure or acceptable treatment for alopecia areata, supports those with the disease, and educates the public about alopecia areata. You can find their website at the link below.


  3. The British Journal of Urology International just published a report that the average penis length flaccid is 3.61 inches and erect is 5.16 inches. Is there a mathematical formula for this relationship?


  4. Download – Avengers Age of Ultron 2015

    When Tony Stark tries to jumpstart a dormant peacekeeping
    program, things go awry and Earth’s Mightiest Heroes, including Iron Man, Captain America, Thor, The Incredible Hulk, Black Widow
    and Hawkeye, are put to the ultimate test as the fate of the planet hangs in the
    balance. As the villainous Ultron emerges, it is up to
    The Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the
    way for a global adventure.

    Director: Joss Whedon
    Writers: Joss Whedon, Stan Lee (comic book)
    Stars: Robert Downey Jr., Chris Evans, Mark Ruffalo
    Genres: Action | Adventure | Sci-Fi | Thriller
    Country: USA
    Language: English

    General Information

    Release Date………:17/05/15


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s