In 2008, a study led by Hans Eiberg from the University of Copenhagen claimed that all blue eyes link back to a single ancestor who lived between 6,000 and 10,000 years ago.

However, they can see violet and blue fairly well, and some cats also see green. Finally, cats' visual acuity is about 20/100, so they need to be five times closer than a human with 20/20 vision ...

Our remote ancestors likely had dark eyes, whether brown or black. Blue eyes are common in northern Europe and emerged some 5,000 years ago. This suggests evolution can be fast.

Eiberg, Hans, et al. "Blue Eye Color in Humans May Be Caused by a Perfectly Associated Founder Mutation in a Regulatory Element Located within the HERC2 Gene Inhibiting OCA2 Expression." ...

Humans are known as trichromats, meaning they have three kinds of cones that allow them to see red, green, and blue. Cats are also thought to be trichromats, but not in the same way that humans are.