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The human eye is the second most complex organ in our body after the brain. We all know that the eye works like a camera. But how exactly does it work? How do we see? The human eye is an amazing organ! For example, did you know that the pupil is not a black circle in the eyeball, but a whole hole? Black, because there is no light inside the eye. In a photo with a flash, it is red, because the light from the camera enters the eye and reflects off the back wall. There are full of blood vessels, which is why the pupils glow red! Or maybe you heard that the cornea does not have blood vessels? It gets oxygen directly from the air, so your eyes breathe! But inside there are full of super-sensitive nerves. When they notice a foreign object, the fastest muscles in the body get to work. And your eyes themselves are the size of a ping-pong ball. And inside such a tiny-looking organ are more than 2 million working parts! #adme Other videos you might be interested in: 14 Exercises to Relieve Tired Eyes • 14 Exercises to Relieve... 7 Rare Eye Colors That Are Found in Humans • 7 Rare Eye Colors That Are Found in Humans What If Our Eyes Saw Two Different Pictures • What If Our Eyes Saw Two Dif... Music: Epidemic Sound https://www.epidemicsound.com/ Subscribe to AdMe: http://goo.gl/DgUonf ---------------------------------------------------------------------------------------- We are on social networks: Stock materials (photos, videos and others): https://www.depositphotos.com https://www.shutterstock.com https://www.eastnews.ru ---------------------------------------------------------------------------------------- More cool articles and videos on http://adme.ru/