The arachnids, which are not spiders, were thought to have only two eyes, compared with many more on spiders. By Veronique Greenwood Guilherme Gainett, then a biologist at the University of ...

After losing its original eyes, one of our distant ancestors may have done what evolution does best: tinkered with what was available, reshaping a single central visual organ into two new eyes. That’s ...

Heterochromia, or two different-colored eyes, is rare in people but common in cats and dogs — here's the pigment and genetics ...

Even Charles Darwin was puzzled by the evolution of the vertebrate eye. New research suggests that it traces back to a cyclopean invertebrate with a single eye atop the head. By Carl Zimmer Look at ...

Most animals have two eyes, but some have multiple for enhanced vision. Let's explore seven animals that posses more than two eyes. Box jellyfish have 24 eyes, some simple for light detection and ...

When we mentally picture an experience from our past or future, it’s not uncommon for us to say that we see that event unfolding “in our mind’s eye.” We use this expression figuratively, of course, ...