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Most Online Radio on Earth today have eyes of one kind of another. Most are made of soft tissue, as ours our. But trilobite eyes are unique. Their lenses are derived from their mineralised external skeleton. They're made of rock. Each one of these little dots is a lens. And each is made from calcite, a crystalline form of chalk. Trilobites were the only organisms ever really to use this stuff as their lens material. And in doing so they evolved very sophisticated vision indeed. For example, these sorts of trilobites had very large lenses. And each lens is readily visible with the naked eye and each one is biconvex. And it's been proven that individual lenses have little bowls inside them to help them focus more precisely. These creatures were among the first, certainly, to actually focus a picture, weren't they? It wasn't just a question of telling light from dark, they could do better than that? On no, these, these had really sophisticated vision. The kind of trilobites that have these eyes were probably hunters. Some people have claimed that they could form stereoscopic images, using both eyes, so they could really home in on the prey. May predators today, including ourselves, have D, or stereoscopic vision. It makes it possible for a hunter to accurately judge the distance between itself and its prey. But not all trilobites were predators. Some were inoffensive creatures that lived by munching mud. But sight must have been valuable for them too, enabling them to spot enemies in time to escape. There are trilobite eyes with more than , lenses. ,? More than , lenses. Now each of those, does it have an image? Each doesn't have an image, but if they go for lots of tiny lenses, they're particularly sensitive to movement, i.e. something changing between one lens and the next. This trilobite's eyes are so big they extend right round its head and meet in the middle. And that suggests that the animal swam high above the sea floor and had a degree view of the scene below. With each lens capable of detecting movement, its owner must have been able to see an enemy coming from any direction.