Human eyeball layers, light micrograph
Light micrograph of the layers of the eyeball showing, from bottom, the sclera, the choroid with blood vessels and many pigment cells, the choriocapillaris (a single layer of blood capillaries) and the layers of retina from pigment epithelium to nerve fibre layer (showing a retinal blood vessel)., by JOSE CALVO / SCIENCE PHOTO LIBRARY
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