The choroid is part of the uveal system and can be found in between the sclera and the retina and is a highly vascularised structure, which helps to provide blood to the outer retina. A reflective layer, known as the tapetum, sits within the choroid and works to reflect light back through the photoreceptors – increasing visual sensitivity. The uveal tract plays a key role in maintenance of the blood-aqueous barrier and disease of its structures can cause a breakdown of this barrier.
