They have 24 eyes arranged in four clusters; 16 are simply light-sensitive pits, but one pair in each cluster is complex, with a sophisticated lens, retina, iris and cornea. Trilobites went down a ...

Pairs of eyes are visible on the heads of these trilobites, Cambropallas telesto, from 520 million years ago. Trilobite compound eyes are the earliest well-preserved visual surfaces in the fossil ...

These small primates have the largest eyes of any mammal, relative to their body size. Each eye is about the same volume as the animal's brain. Trilobites lived between 521 and 252 million years ago.

A highlight focused on the development of the trilobite eye — one of the most complex ever captured in the fossil record. Trilobite eyes were made of a staggering number of tiny calcite lenses ...