This image has turned into a big viral challenge on the Internet. Many have discovered problems they didn't know they had.
Are you sure that your eyesight is perfect? Do you know that you're a bit of nearsighted or farsighted but suspect you might have something else? Well, this photo appears to be able to solve that mystery in a couple of seconds.
The number that you see reveals if you have hyperopia (poor vision up close), astigmatism (blurred vision), myopia (poor vision from afar) or a mixture of these.
Do you dare to test your eyesight? Well, hit the play button and find out.
Disclaimer: it's just a picture. If you think you might suffer from a serious problem with your eyesight, always consult a specialist.