STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Eye anatomy. Coloured scanning electron micrograph (SEM) showing part of the ciliary body (red) and iris (right) of an eye. The ciliary body is a ring-shaped structure that surrounds the iris and joins to ligaments that hold the lens in place behind the iris. It also contains the ciliary muscle that is contracted to alter the curvature of the lens and focus light on the retina at the back of the eye. Magnification: x20 when printed 10 centimetres wide.
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