MANFRED KAGE / SCIENCE PHOTO LIBRARY. MANFRED KAGE / SCIENCE PHOTO LIBRARY.
Light micrograph of a section through the human eye, showing the area where the optic nerve (central pink body) penetrates the sclera (blue), and the immediately overlying choroid layer (rich in blood vessels - small red circular areas) to merge with nerve fibres of the retina (the outer, multilayered, light-sensitive lining). The area where nerve fibres of the retina converge to form the beginnings of the optic nerve is called the optic papilla or optic disc. Photoreceptor cells are absent from the optic disc, ie it is a blind spot on the retina. The red kidney-shaped mass in centre of the optic nerve is an artery. Magnification: X100 at 6x7cm, X43 at 35mm size.
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