The brain is a very smart part of the human body, as you can already tell. The brain also starts at the cornea, and of course it has to end at the end of the brain. This is some of the pathway that light takes to our eye. This is also a signal for our brain to interpret. I will show you the whole way through, so that you could understand.
The first step would have to be that the image passes through the iris. Next, the image goes through the lens and the cornea. Finally, the image goes through the blind spot, and comes out through the brain. So, next time you see an image remind yourself that the image goes through this whole processes just so that you could see the image yu are trying to see.