What if the optic nerve is inverted and the brain is passed the image right side up? But my guess as to why it is inverted is because it is easier to focus light if the rays travel straight through a focusing lens. Light from the top is coming down through the hole in your eye and wants to keep going down. So the top is on the bottom after passing through the focal point. Provided the optic nerve is inverted, the image is passed to the brain right side up.
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