Your peripheral vision makes up part of your overall field of vision, which is around 190 degrees. However, it’s far from perfect, and sometimes it causes us to see things which don’t really exist. We’ve found a cool way to prove this to you.

All you need to do is focus on the cross at the centre of the picture below, without glancing away. You’ll notice how your peripheral vision turns people’s ordinary faces into those of ’monsters.’

The faces begin to become distorted, right? And the longer we look at the centre of the picture, the greater the distortion. Why does this happen? We’ll explain everything step by step.

There’s an area of our retina which is called the yellow spot. It contains the largest number of receptors in the eyeball, thanks to which we can see a given area more clearly. Let’s call this area the main field of vision. It covers around 10% of the entire range of our vision, and shows what our eyes are directly focused on.