Physics Lab Kits - physics experiment to demonstrate the principles of nearsightedness and farsightedness by exploring the imaging rules of convex lenses

Light source holder, water injector, F-type light source, white barrier, pinhole imaging plate, biconvex lens, water lens

This experiment can be used to demonstrate to students the principle of nearsightedness in human eyes. Its essence is similar to that of convex lens imaging. As shown in the figure, the human eye's crystalline lens is equivalent to a convex lens. When a convex lens becomes thicker, its focal length becomes smaller, as shown in Figure 2 above, causing nearsighted people to see objects imaged in front of their retina instead of exactly on their retina, so nearsighted people see objects as blurry.
Here is a question: In our experiment, we see an inverted image of an object on a white barrier. Since our human eye's crystalline lens is equivalent to a convex lens, why don't we see objects around us upside down? In fact, when an object enters our eyes, it is indeed imaged upside down, but it is converted into a positive image by our brain.