Eyes have been around for at least half a billion years, first appearing in the fossil record during what’s known as the Cambrian Explosion when all kinds of different animals like trilobite, starfish …came onto the scene. It’s thought that eyes have independently evolved at least 50 different times which makes sense. Even a simple eye is a useful tool giving you the evolutionary advantage over the sightless species around you. With your visionary superpower you can scan your surroundings, looking out for predators, prey or somewhere to live. Over the years eyes have diversified into all kinds of weird and wonderful forms.