Add Yahoo as a preferred source to see more of our stories on Google. blue eyes optical illusion Optical illusions can sometimes trick us into seeing things that aren't there, including colour, and ...

Look closely into a pair of blue eyes and you might think you’re staring into something dyed with pigment, like a sapphire or a painted sky. But here’s the thing: blue eyes aren’t really blue at all.

From colour-changing fire trucks to 'The Dress', many optical illusions have baffled the internet over the years. Now, a scientist from Harvard Medical School has discovered an illusion that might be ...