Question: Why does our retina sees things backwards and is it possible for our retina to see things the right way but our brain to flip upside down so you will see things upside down forever?

Oli Wilson answered on 17 Nov 2017:

Our retinas see things upside-down because light gets bent quite a lot when it comes into our eyes – both by the cornea (the eye’s front cover) and by the lens. Almost every image your brain ever sees is actually upside down, but it manages to deal with it and show you stuff the right way up. If you spend long enough looking at things upside down (I think there are special glasses that can make that happen) eventually your brain will work it out and realise it doesn’t need to keep flipping the images any more – so you start seeing stuff the normal way again. I think there’d need to be a problem with your brain for images to get stuck upside down!