This is a side view of the eye of a male Somatochlora albicincta, photographed by Truman Sherk, who received his PhD degree from a dissertation about the anatomy and development of dragonfly eyes, a study still unique in odonatology. There are over 12,000 ommatidia (simple eyes) in this compound eye. If you don't believe me, count them!
This same photo is also in Dragonflies: Behavior and Ecology of Odonata, by Philip S. Corbet (Cornell University Press, 1999). You can learn much more about dragonfly vision there.
