I think they meant 20/25 corrected vision.
20/20 isn't perfect, but it's average healthy vision and it's more or less where most of the world tends to end up. Some people test better, though. 20/15 is not unheard of.
However, the difference between 20/20 and 20/25 is, for most people, absolutely unnoticeable and I can't imagine someone prescribing glasses for such a minor refractive error- they'd probably have a great deal of difficulty making glasses in a prescription THAT low.
Many, if not most, people with 20/30-20/40 uncorrected vision rarely, or never, wear glasses. 20/40 vision is a-okay in terms of being able to drive without wearing your glasses, as well.