Our brain and eyes can play tricks on us—not least when it comes to the expanding hole illusion. A new computational model ...

but how much attention do we give our eye health? The World Health Organization reports that around 2.2 billion people ...

Today’s optical illusion is challenging viewers to find a hidden "5" among a sea of "2s." The tricky pattern plays with human perception, making it hard to spot the odd number. Can you find it?