This story explains a good deal about how people with low vision see the world.
A friend returned to his old school and entered what used to be the common room. He saw the piano in the far right corner and made straight for it; but it was gone.
So how come a piano can vanish in the twinkling of an eye? My friend was seeing the commonroom via a memory, the mental image of the room which remained stored in his brain. His current weak vision failed to reveal the missing piano to his eyes.
In other words, we who have weak vision depend on our brains to complete the visual picture we see and its great. Unfortunately the reality spells a danger not known to our brain and that’s when we get into trouble. That’s why we sometimes appear to actually see quite well while other times we appear pretty well blind.
It’s the brain that does It stupid!!!