I like computers?
My right eye is "fine" externally, but my vision with it is god awful.
With my glasses on, using only my right eye, I can read the ModRetro logo at the top.
I cannot, however, read what I'm typing.
I am pretty near sighted, but I never wear my glasses. When I do, my eyes rely on them and I really NEED them. If I do not use them, then something to do with my focusing muscles having to stay in shape lets me see a lot better.
Look, you can clean the lens all you want. But if you buff it enough to remove anything other than very small scratches, then the curve of the lens will be altered too much for them to work very well for correcting vision.