Tuesday, March 8, 2011

Blood-ocular Barrier

The blood-ocular barrier is a physical barrier between the local blood vessels and most parts of the eyeball. It prevents many foreign substances from going through it. The blood-ocular barrier is composed of two barriers: 1) the blood-aqueous barrier, which consists of the ciliary epithelium and the capillaries of the iris; 2) the blood-retinal barrier, which is made up of non-fenestrated capillaries of the retinal circulation and tight junction between retinal epithelial cells, stopping large molecules from choriocapillaries from entering the retina.