You have 20/20 vision if you can spot the smiling face hidden among the crowd of frowning people in under seven seconds

ONLY those with perfect vision will be able to solve this tricky puzzle in a matter of seconds.

Regular practice of mind-boggling brainteasers such as these can help improve your health in several ways while also helping you keep your cool under pressure.

Everyone can see the grumpy faces in this crowd of cartoon people, but can you spot the one happy person?

You have just seven seconds...