Cat eyes are so unique — their irises have a range of beautiful colors, and their pupils are shaped as a long narrow slit. ... Other than that, using human eye drops on cats is dangerous.

Cats may have been first domesticated as early as 4,000 years ago by the ancient Egyptians. Cats can see up to six times better than an average human in the dark.

Humans have a third type of opsin, making our eyes trichromatic. But “it's not as if [cats] can only see two colors,” Kornreich says. Colors combine to create various blends that cats perceive ...

Cats do smile, but not in the way that humans do – while we bare a grin to show our happiness, cats smile with their eyes, says Marci Koski, a feline behavior and training consultant.

Like humans, cats use their vision to see the world around them—and to hunt down their next snack. But differences between human and cat eyes mean that we see the world quite differently.