A typical fly has five eyes : two large compound eyes and three small simple eyes (ocelli) on the top of its head.

Quick Scoop: How many eyes does a fly have?

Most people only notice the two big “bug eyes,” but a fly’s visual setup is more layered than that.

  • 2 compound eyes (the huge ones on the sides of the head).
  • 3 simple eyes (ocelli) in a small triangle on top of the head.
  • Total: 5 eyes on a common house fly.

Each compound eye is made of thousands of tiny lenses (ommatidia) , which is why flies are so good at detecting motion and dodging your hand or a fly swatter.

So even though we say “five eyes,” a fly’s vision is built from thousands of microscopic units working together.

TL;DR: A housefly has 5 eyes in total: 2 big compound eyes plus 3 tiny simple eyes on top of its head.