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Just a minor correction to what you said, petey. 20/20 vision isn't "perfect" it's only average. It means you see at 20 feet what the average person sees at 20 feet.
That's how you can be 20/15. You can now see at 20 feet what the average person can see at 15. So your vision is now five feet "better" than average.
For most of my life, I was 20/12 (the nearest that the eye doc could judge). Not quite 20/10 but better than 20/15. Not any longer, but I'm spoiled: 20/20 seems like half-blind to me.
Serious congrats to you, bud.
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