FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Damselfly eye. Close-up of one of the compound eyes of a damselfly (order Odonata), showing the individual lenses (ommatidia, hexagonal). Each ommatidium is a tiny simple eye that sends a signal to the fly's brain. The brain combines the thousands of images to form a mosaic view of the world. The image is not sharp but is excellent at detecting movement. Magnification: x57 when printed 10 centimetres wide.
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