Definition: The vascular layer of the eye that lies between the retina and the sclera. It contains the retinal pigmented epithelial cells and provides oxygen and nourishment to the retina.
The dark-colored pigment in the choroid absorbs light and limits reflections within the eye that could degrade vision. The choriodal pigment is what causes "red eyes" when flashed pictures are taken.
Also Known As: choroidea; choroid coat
