How Do We See

we all have a eye. but wait how do we see?
we can see because the sun hits the tree. on the tree the top is part a the bottom is part b. so part b goes to the top of the eye and part a goes to the bottom of the eye and it reflects a upside down image then it gets send to the brain and the brain flips the image and thats what we see and how we see.
important eye parts:
the pupil
the retina
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include more eye parts .