20/20 is considered normal vision.Ok... 25/20 is above average vision right? That's what I had in my early twenties.
What happened?
20/10 would be better.
20/30 would be worse.
Also remember that you have both near and far vision.
If I understand correctly, if you have 20/10 vision, it would mean that at 20 feet you can read what a normal person can read at 10 feet. Likewise, if you have 20/200 vision, that means you can read at 20 feet what a normal person can read at 200 feet.