Take This Near Impossible Vision Test Are you ready to challenge yourself this afternoon? Then you might want to try this vision test, published by BigKnows on YouTube. This test gives a unique perspective on just how good your eyes are. In the mind-boggling test, youll see a group of letters or numbers lined up. Its your job to pick the one letter or number that is different from the rest of the group. It seems simple enough, but give it a try and see just how much focus it takes to complete them. Finding the letter B in a group of Rs can be harder than you might imagine. Watch the video below and let us know how you do! 