What are compound eyes?
Human beings and most animals have simple eyes, but some insects and marine animals have compound eyes.
Compund eyes are different from human eyes. human eyes have a single lens for each eye, while Compund eyes have many lenses.
Each unit has its own surface area, lens and optic nerve fibre. Each unit receives light from a small part of the animal's field of view. The animal's brain combines these views into a single image.
An insect's compund eyes bulge out, and have a wide field of vision. The lenses in compund eyes can't change focus, so insects can't see things that are far away. The compund eye is very good at seeing things nearby, and detecting motion, which is why it is so difficult to swat a fly!
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