Skip to Content
UW Health SMPH
American Family Children's Hospital
DONATE Donate
SHARE TEXT

Aqueous Humor

The shape of the front part of the eye is maintained by a fluid called aqueous humor.

  • Aqueous humor is made by the ciliary body. Strands from the ciliary body support the lens behind the colored part of the eye (iris).
  • Aqueous humor flows into the front of the eye through the pupil.
  • Aqueous humor drains out of the eye through the trabecular meshwork. The trabecular meshwork is a spongy mass of tiny canals located in the drainage angle. The drainage angle is located between the iris and the clear covering of the eye (cornea), where the iris meets the white outer covering (sclera) of the eye.
  • Aqueous humor is returned into the bloodstream through a tiny channel (Schlemm's canal) located under the trabecular meshwork.

Aqueous humor is produced by and removed from the eye at a constant rate [about 1 tsp (5 mL) a day] to maintain a constant pressure in the front (anterior) chamber of the eye. While pressure in the eye varies throughout the day, the normal pressure within the eye is 10 mm Hg to 21 mm Hg.

Last Revised: February 28, 2012

Author: Healthwise Staff

Medical Review: Adam Husney, MD - Family Medicine & Christopher J. Rudnisky, MD, MPH, FRCSC - Ophthalmology

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

© 1995-2014 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.