Fascinating. What did you see? =)

This is fascinating !!! ..... Look at the picture here:

Those who have perfect eyesight ... will see Einstein. Those who are shortsighted ... will see Marilyn Monroe.

For those with perfect eyesight, if you squint your eyes, you'll be able to see Marilyn Monroe too ! If you see with your specs on, you'll see Einstein.

With your specs off, you'll see Monroe.

Thus with this Einstein/Monroe, it'll be easy to judge whether you've perfect eyesight or not. If you are unable to see Marilyn Monroe, suggest to minimise the image ...

Have fun!