Look closely at the above image. What do you see? If you're like most people, you probably see a slightly blurry-looking image of Albert Einstein. If on the other hand you see Marilyn Monroe, it may be time to visit your optometrist for an eye exam.
That's because at a normal viewing distance, healthy eyes should be able to pick out the details and lines on good old Albert's face. Eyes that are struggling, however, will not be able to make out the details and instead will see the Marilyn Monroe image underneath. (You can replicate this process by moving further away from the image until you can see the blonde bombshell appear).
This unique optical illusion was created several years ago by neuroscientists at the Massachusetts Institute of Technology, who spent over a decade creating hybrid images to demonstrate how images can be hidden with textures and various objects. "Marilyn Einstein" was created by superimposing a blurry picture of Marilyn Monroe over a picture of Albert Einstein that was drawn with fine lines.
For more details, check out this recent video from AsapScience which talks a little bit more about how this happens:
If you're seeing Marilyn Monroe (or are concerned about your vision), book a complete eye exam at an FYidoctors near you.