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The eyes of the fly generally occupy a large part of the head and are among the most complex in the insect world. They are eyes made up of 18,000 ommatidia and each one representing an individual unit to detect light. A rainbow can form from the light reflected from the donkey fly's eye.
The fly's eyes do not have lids, so the fly rubs its eyes with its feet to keep its eyes clean. The common house fly has distinctive compound eyes. Compound eyes are made up of hundreds of different lenses and give the fly the uncanny ability to recognize many different perceptions of light and movement. If you ever want to kill a fly and wonder how it can fly so fast, this has a lot to do with the fly's compound eyes. These also help the house fly in flight to avoid obstacles.
They are composed of a large number (several thousand) of individual eyes, similar to tiny telescopes whose longitudinal axes are slightly divergent, so they point in all directions, thus forming a global mosaic-like image. In other words, they have no blind spots, hence they see us coming from wherever they are.
The hairs of the flies