A year ago I thought I had close to perfect vision. Meaning I could see stuff. Then one day I put on my friend's glasses and that stuff looked less blurry! I'm a touch short-sighted, so anything beyond about five meters gets a bit blurry. I do have glasses and I wear them so I can see powerpoints in lectures and occasionally to drive. But I can see fairly well without them. =D
I think I have good eyesight. But I do have a pair but it had no grade whatsoever.