I've heard a lot of people say their vision has gotten better eating (*Low fat) high carb Vegan.
I wouldn't expect it to give you perfect vision, but I'd expect an improvement.
As nice as it would be I don't think there's much you can do about poor vision once you're an adult. A lot of those eye problems become permanent after childhood and wearing glasses when you're growing makes it even worse.
long time 30BaD member cured his vision, see his website here: http://www.thecureforblur.com/
Tried his method... worked like a charm. Vision went down to -2 both eyes from -4.5. Diet and other lifestyle factors on 811 alone may have played a factor though. :)