CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Mosquito compound eyes, with the base of the antennae between them. The units in a compound eye, the ommatidia, each contain a cornea and photoreceptor cells, and are capped by a cuticular biconvex lens. It is the cumulative effect of these that produces the vision of a compound eye. A compound eye is not very good at distinguishing detail, but it does enable the detection of tiny movements.
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