How the eye works

At first glance, our eyes have a lot in common with a camera. They both have an opening for light to enter, a lens to focus, and a light sensitive layer at the back.

But although cameras are getting smarter, your eyes are even more amazing. For example, each eye contains around 126 million photoreceptor cells. Meaning your eyes are really, really, really HD.

In fact, your eyes are the most complex part of your body – apart from your brain of course.

Let’s take a closer look.