How do some people regain perfect vision w/o surgery?!

It depends on what the glasses were prescribed for originally, and if their prescription is week or strong....

Usually, young people are slightly longsighted... and as they grow older (around puberty) their eyes grow a lot and correct for their longsightedness. So this could be what happened to your friend.

As for your friend's mother... it's more rare... but best to just ask them.

Peoples eyesight does change as tehy grow , sometimes for better and sometimes for worse. your friend is one of hte lucky ones. With her mom, the question is how bad her eyesight was to start off with. If it wasnt' that bad then she might just feel she can manage day to day withotu glasses and doesn't bother to wear them. You have to ask though - I've known people claim that their eyesight has improved naturally to the general world when they have in fact had surgery.

Did you ever think to ask them? I'd sure like to know how they did that too.