In the animal kingdom, eyes have evolved dozens of times. We’re familiar with the camera-style eyes in our own heads, and the weird compound eyes of insects, but there are far weirder ones out there. Scientists are discovering new structures and adaptations all the time. There are eyes with mirrors, eyes with optical fibres, and eyes with bifocal lenses. There are eyes that see in the dark, move around heads, or go into sleep mode. There are even eyes made of rock. This slideshow will take you on a tour of some of these recent eye-opening discoveries.

Eyes don’t even have to be organic. While most animal lenses are made of proteins, the fuzzy chiton – an armoured relative of snails