Retina. Coloured scanning electron micrograph (SEM) of a section through a human retina, the light-sensitive tissue that lines the inside of the eye. Light entering the eye passes through several layers of cells before reaching the light receptors. From left to right are seen: the surface layer (brown), cell bodies of optical ganglion cells (pale red), which form the optic nerve; cell bodies of bipolar neurons and of the receptor cells (red); and the rod (white) and cone (yellow) receptors. Rod cells differentiate light and dark, whereas cone cells allow colour vision. Magnification: x840 when printed 10 centimetres wide.

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