Male striped horsefly
The larger ommatidia at the top of the eye are more sensitive to UV light, and help him spot the fast-flying female flies, while the smaller ommatidia help him hone in on details.
Camel
Two eyelids with very long lashes keep sand from blowing into a camel's eyes. A third eyelid sweeps across from the corner of the eye to help clean the surface.
Mantis shrimps
Mantis shrimps probably have the most sophisticated vision in the animal kingdom.
California purple sea urchin
California purple sea urchin is so packed with photoreceptors on its surface that its body has been described as a single functional eye.
Chameleon
Chameleons have some of the strangest eyes on the planet, which are able to move independently of each other. This results in almost 360-degree vision.
Ostrich
An ostrich's eye is bigger than its brain, and is the largest eye of any living land animal, measuring five centimetres across.
Four-eyed fish
Able to see above and below the water line at the same time, the four-eyed fish has eyes that are split in half horizontally.
Reindeer
The eyes of Arctic reindeer change colour with the seasons, from gold in the summer to blue in the winter.
Colossal squid
Researchers believe the colossal squid's eyes are the largest of any living creature, measuring over 27 centimetres in diameter - the size of a football.
Dragonflies
And with eyes covering almost their entire head, they have nearly 360-degree vision too.