Why can't my brain correct my vision (details)?

If this is how we really see, and our brain corrects it to how we see now, why can’t it fix blurry vision?

That image is blurry, upside down, black spots, weird eye veins and our brain has no problem correcting it.

I get vision is also how light hits our eyes, but you cannot tell me that image above has nothing to do with the way light hits our eyes?

So, why can I not see? My vision is really bad, everything blends together. I could not function without my glasses, literally.