You’ve probably heard that all people with blue eyes are related, but is there any truth to that statement? Or if there is, why? It turns out the genetic history of blue eyes is pretty twisty and ...

Blue and grey eyes, on the other hand, only have dark brown pigment on the back layer of the eye. The stroma has no pigment, but it does have small particles suspended in it. These particles give ...

Gray spots in your eye may be harmless, due to age or even injury. But they can also be a sign of a more serious condition, including the start of cancer.

However, the blue tapetum also lets up to 60 percent of UV light pass through to the eye’s color sensors. The reindeer likely see the winter world as a shade of purple the way a human may see a ...

Here's an optical illusion that can confuse pretty much any creature with eyes. It's a simple trick caused by a quirk in the way many animals (including ...