Dragonfly eye closeup

Dragonfly compound eyes are among the most advanced in the animal kingdom, with up to 30,000 ommatidia providing near-panoramic vision.

About this subject

Dragonfly eyes are extraordinary biological structures. Unlike human eyes, each dragonfly eye is composed of thousands of individual units called ommatidia. An adult dragonfly can have between 20,000 and 30,000 ommatidia per eye, providing a nearly 360-degree field of vision. This adaptation is crucial for survival, allowing them to detect prey and predators in almost any direction without moving their head.

Dragonfly vision is exceptionally fast. They process images at about 200 frames per second, while humans see at roughly 60 frames per second. This allows them to track and intercept mosquitoes and other insects in mid-flight with a success rate of over 95%. Additionally, their eyes are sensitive to ultraviolet and polarized light, aiding navigation and locating water bodies for reproduction.

Interestingly, dragonflies have existed for over 300 million years, long before dinosaurs. Fossils show prehistoric dragonflies like Meganeura had wingspans up to 70 centimeters. Although modern ones are smaller, their eyes remain a fascinating evolutionary example. The structure of ommatidia has inspired optical technologies such as omnidirectional cameras and artificial vision sensors.

In Brazil, dragonflies can be found in virtually every region, especially near lakes, rivers, and swamps. They are important biological controllers of mosquitoes, including Aedes aegypti. Observing their eyes in close-up reveals geometric patterns and iridescent colors that vary by species and light incidence.

Frequently Asked Questions

How many ommatidia does a dragonfly eye have?

An adult dragonfly has between 20,000 and 30,000 ommatidia per eye, depending on the species.

Do dragonflies see color?

Yes, they see color and are also sensitive to ultraviolet and polarized light, which aids in hunting and navigation.

What is the advantage of compound eyes for dragonflies?

Compound eyes provide a nearly panoramic field of vision and high visual processing speed, essential for capturing prey in flight.