The anterior segment is the front third of the eye that includes the structures in front of the vitreous humour: thecornea, iris, ciliary body, and lens.

Within the anterior segment are two fluid-filled spaces:

  • the anterior chamber between the posterior surface of the cornea (i.e. the corneal endothelium) and the iris.
  • the posterior chamber between the iris and the front face of the vitreous.

Aqueous humor fills these spaces within the anterior segment and provides nutrients to the surrounding structures.

This definition incorporates text from the wikipedia website - Wikipedia: The free encyclopedia. (2004, July 22). FL: Wikimedia Foundation, Inc. Retrieved August 10, 2004, from


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