The way I understand it is that because light travels in a straight line (the light from the bottom a glass travels to the top of your rear eye and the light from the top of the glass travels to the bottom) like a pinhole – this convergence causes the image to be the inverse.
IMO – it’s a sorry ass design – god must have been too tired or was high when he made them. Not unlike a single pipe (esophagus) that’s used for both air and food. Oh and our pleasure center being at the same spot as our waste removal.
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