Hi,
I spent 4 years working on something called the Bates Method - google it and you can find out loads.
For me, unfortunately, there was no success, indeed my acuity worsened over the time from -0.25 to -2.25, but I have heard of other people who claim to have improved their eyesight.
For me, my optition has convinced me that myopia and other acuity problems are genetic, but there are loads of different views out there.
Hope this helps.