Concerned about your vision? The video above provides a quick test to determine how good your eyesight is — and then lets you compare your vision with other people around you.

The video, created by the YouTube channel AsapSCIENCE, will show you an image that, depending on your eyesight, will either look like Albert Einstein or Marilyn Monroe. If you have good eyesight, you’re more likely to see Einstein — but the farther away you get, the more likely you are to see Monroe.

After the quick test, the video explains the science behind this optical phenomenon.