Believe it or not, light takes a certain pathway when it reaches your eye. I mean, you can see it since you have your eyes open, but it's more complex than that. When light reaches your eyes, it has to start with the cornea first. The cornea is the outer layer of your eye. Then the light travels into the other parts of your eye. Some of the parts you may know as the pupil, lens, blind spot, nerve system, etc. Once it passes the cornea, it gets more complex. 
           In order for you to see something, your brain has to interpret it by receiving the signal from the light. That's why the light travels into your eye through many parts. Once it passes the cornea, it then goes to your lens. After that, it goes to your pupil, then into your nerve system. Of course, your nerve system is connected to your brain. So that's when your brain is able to receive the signal and then interpret. It's not as simple as it sounds, but it happens very quickly. You don't really feel the light going through all this process. 

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