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24th August 2015
11:37am BST

According to ASAP Science, the illusion works by determining your eyes ability to focus from afar:
"Depending on how well you're able to focus or pick up contrast, your eye will only pick out details. Up close, we're generally able to pick up fine details like Einstein's moustache and wrinkles. But as the distance increases, or if your vision is poor and creates a more blurred image in the first place, your ability to pick up details fades away."
So now you know whether you need to book that eye test or not…
H/T: SeventeenExplore more on these topics: