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How many eyes does an insect have?

Insects come in lots of shapes and sizes, and they have different numbers of eyes too.

The head of a praying mantis

This praying mantis (above) has five eyes.

Some insects have five eyes while most don’t have that many. What makes it a bit complicated is that insects have two types of eyes: compound eyes and simple eyes. Some have one type, and some have both types of eyes.

Dragonfly

The eyes of a dragonfly, and at right, an enlarged section from the photo.

Compound eyes

I’ll start by talking about compound eyes because they’re usually the first ones you notice. If you look at the photo of the dragonfly head above and the enlarged section from the photo alongside it, you’ll see that the surface of those big eyes is covered with lots of facets. Each one of those facets is a lens, and when you cluster all those lenses together into the one structure you end up with a compound eye. That dragonfly has two of those compound eyes, and with all of those lenses working at once it would be able to see in almost every direction without moving its head.

And look at the photo of the fly below. The big, red compound eyes, covered in lots of individual lenses like in the dragonfly, are clearly visible on each side of its head.

Fly

The two large (red) compound eyes are clearly visible in this picture of a fly.

Scientists believe those compound eyes would provide the fly a crisp, detailed view of the things nearby. However, they also believe that as things get further away from the fly, they would become less clear. So the idea is that the compound eyes give sharp images of things up close and a blurred view of stuff in the distance.

Simple eyes

Flies don’t just have those big compound eyes. They also have simple eyes. Simple eyes don’t have lots of lenses covering their surface like compound eyes. Instead, each simple eye is a single lens. If you look at the photo below you’ll see a triangular formation of three orange-brown dots. Those are the simple eyes and the photo alongside it shows where they can be found on top of the fly’s head, in between the big compound eyes.

close-up of a fly's head showing the simple eyes

So that’s a total of five eyes on the fly. Insects can have as many as three simple eyes. Scientists believe those simple eyes wouldn’t be so good at seeing detail, but helpful in seeing movement.

Wasp head


Have a look at the next photo (at right) and you’ll see there are five eyes on the European Wasp too.

Beetle

Beetles have two compound eyes

Now when you have a look at this beetle (at right) you’ll see that it lacks the three small simple eyes and only has the two compound eyes.

I started this by saying insects come in lots of shapes and sizes. That kind of diversity applies to insect sight too. For example, it’s believed that some insects see colours and some don’t. Some have small eyes, while a dragonfly has huge compound eyes covering most of its head. Those elaborate compound eyes on the dragonfly would help it fly with a lot of precision and with lots of speed, seeing other insects and not bumping into things.

So now we know all that stuff, how many eyes do insects have? The answer is: usually two, but a whole lot of them have as many as five.

How many eyes do spiders have?

 

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