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3rd April 2015
05:19pm BST

The faster the image changes, the better your eyesight and if it doesn't change at all, you might want to consider visiting an optician.
The illusion was created by a research team at Massachusetts Institute of Technology, led by Professor Aude Oliva.
It tests your ability to focus and pick up contrasts and the science behind it is explained in the below YouTube video.
https://www.youtube.com/watch?v=tB5-JahAXfcExplore more on these topics: