@Perdido - I know what you mean. I’ve also been forced to wear an eye patch before, and you never really know how much you need both eyes until you lose sight in one of them.
My husband is having to undergo binocular vision therapy, because one of his eyes tends to turn inward more than the other. It isn’t obvious while looking at him, but it has affected his binocular vision.
The doctor tried giving him glasses at first, but this didn’t help much. Lenses couldn’t fix the issue. He has to train his eye to focus differently, which will take time, but his vision will be so much better.