Robber flies have great eyesight.
They have to, as they are carnivorous hunters of the insect world.
Built stout and sturdy, they grab insects in a vice like grip.
Anything their size or smaller is fair game.
They will often fly with their prey locked under them, held in place with strong legs.
I was lucky enough to see one finishing a meal, though not lucky enough to capture it with the camera. I was able to photograph those sharp compound eyes though.
A couple of photos below: one showing the eye structure, the other the design of the insect itself.