Retinal Pigment Epithelium (RPE)
A single layer of hexagonally shaped, pigmented, epithelium cells, forming a boundary between the sensory retina and the choroid. The pigmented cells absorb stray light, preventing any further scattering in the eye. They phagocytose dead and damaged photoreceptor cells from the retina and also store Vitamin A for the photoreceptors. The RPE acts as a limiting membrane, controlling the movement of substances between the retina and choroid.