Trying to test your eyesight? Well you can with this new mind-boggling optical illusion . It's no secret regular puzzles and brainteasers could teach you how your eyes and brain work together to see. Researchers believe some illusions can cause you to be fooled as your brain constantly tries to make predictions on what will happen next. Optical illusions are a perfectly natural phenomenon and don't necessarily reflect your eye health or brain health. Now if you think you've got what it takes,