2. Fluid System of the Eye
• Intraocular fluid keeps the eyeball round and distended.
• 2 fluid chambers:
1. aqueous humor which is in front of the lens freely flowing fluid
2. vitreous humor which is behind the lens gelatinous mass with
little flow of fluid
3.
4.
5.
6. Aqueous Humor
• Clear, colorless fluid that fills the anterior and posterior chambers of the
eye.
• Produced by the ciliary processes of the ciliary body at a rate of 2-3 µl/min
• Freely flowing fluid
• Balance between formation and reabsorption regulates intraocular pressure
7.
8.
9.
10.
11.
12.
13.
14.
15. Intraocular Pressure
• Refers to the pressure exerted by the
intraocular contents on the eyeball
• Normally 15 mm Hg with a range of
12-20 mm Hg.
• IOP is maintained by the a dynamic
equilibrium between the aqueous
humor formation, aqueous humor
outflow, and venous pressure
16.
17. Glaucoma
• Increase in intraocular pressure caused by an
increase in resistance to outflow of aqueous
humor through a network of trabeculae in the
canal of schlemm
• IOP rise up to 60-70 mmHg
• Can cause blindness due to compression of the
axons of the optic nerve
