May 1983
Volume 24, Issue 5
Articles  |   May 1983
How do tears exit?
Investigative Ophthalmology & Visual Science May 1983, Vol.24, 619-622. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      M A Lemp, H H Weiler; How do tears exit?. Invest. Ophthalmol. Vis. Sci. 1983;24(5):619-622.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements
This content is PDF only. Please click on the PDF icon to access.

The mechanisms of tear flow, blinking, and tear drainage were studied employing high speed slit-lamp cinematography using a polystyrene microsphere suspension as a tracer of tear movement. It was demonstrated that: (1) Tears are drawn into the canaliculi during the relaxation phase of blinking. (2) Both superior and inferior puncta function as normal tear drainage routes. (3) The superior punctum alone is sufficient to handle tear drainage. (4) There is some regurgitation of tears from the canaliculi. (5) An intact blink mechanism is necessary for effective tear drainage. (6) There is an actual closure of the puncta during blinking. This is sufficient to effect tear exit without the lids meeting. The clinical impression that in order to effectively prevent tear drainage in the treatment of dry eyes, it is necessary to occlude both the superior and inferior puncta was confirmed.


This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.