Aqueous Humor

The aqueous Humeur is a transparent liquid with low viscosity, deprived of illustrated elements of the blood, continuously filtered and renewed which, with the Corps glazed, maintains the pressure intraocular and the form of the Eye-ball.

The aqueous humor is made up of 99,6 % of water, but also of Vitamin C, Glucose, Lactic acid, Na and Cl as a majority and it is low in Protéine S and amino-acids.

It is renewed into two to three hours and makes it possible to nourish the Cornée which does not have any Blood-vessel to irrigate it. The defect of reabsorption of the aqueous humor will involve an intraocular hyperpression being able to damage the nervous nets definitively and the sensory cells, one speaks then about Glaucome which can lead to the irreversible Cécité. The drainage of the aqueous humor is done on the level of a network trabéculaire by the channel of Schlemm, then via the vorticineuses and sclerous veins in the opthalmic vein and the lower petrous sine (joining pétro-basilaire) and finally the jugular Veine interns.

Composition

The aqueous humor is primarily made up of water, but also of vitamin C, glucose, lactic acid and proteins. It constantly renews the every 2-3 hours. Its role is especially feeder (corneal endothelium and iris), repairer, regulator of the intraocular pressure, as well as maintenance of the shape of the eye. The normal pressure of the eye for subjects of less than 40 years is of 13-19 Misters At the subjects of more than 40 years, it is of 16-23 Misters.

Secretion of the aqueous humor

Filtration

Blood in the capillaries of the Corps ciliaire is filtered coarsely by the cells endothéliales and its plasma finds in the stroma body ciliaire. The pigmented and not pigmented cells refiltrent this plasma towards the posterior room.

Model of Diamond-Bossert

The action of the active transport of the not pigmented cells of the body ciliaire armature of the gradients of osmotic Pressure in the side intercellular space of these cells. The great concentration of the proximale part of intercellular space involves water in the channel. The osmotic pressure thus decreases by proximal into distal of the channel and the aqueous humor runs out about it.

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