CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Human retina. Light microscope footage of a section through part of the retina of the human eye, showing rods and cones. The retina is a light-sensitive layer at the back of the eye. It contains photoreceptor cells (centre), called rods and cones, which allow the eye to detect light at low intensities (rod cells) and to distinguish between colours (cone cells). Light falling on the retina is relayed as electrical signals from the rods and cones through various layers of nerve cells. The signals are transmitted via the optic nerve to the brain which processes them into visual images. Magnification unknown.
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