Work Step by Step
The image formed on your retina by the converging lens in your eye is real, so the image is inverted. Your brains corrects for that, and the world appears to be upright. Experiments have been done where subjects wear special lenses that distort or flip the light entering the eyes. Amazingly, after a short while the brain acclimates and the subject sees everything normally. Hilarity ensues when the special glasses are then removed, but again, the effects are only temporary.