Light micrograph showing the choroid and retina. From top to bottom are the: sclera, heavily pigmented choroid with a large blood vessel (Haller?檚 layer) and small capillaries next to the retina (choriocapillaris), and outermost layers of retina, i.e. pigment epithelium, rod and cones layer. Near the bottom is the external limiting layer and some nuclei of the outer nuclear layer.