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 ...

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.

The team also revealed that only a few million years later, improved compound eyes with higher resolution developed in another trilobite species from the present-day Baltic region. The study is ...

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 ...

for each group Redlichiida – These early trilobites tend to be very flat and have crescent shaped eyes. The third segment from the head often has large spines extending out to the side. Phacopida – ...