I think Todd's slide fully defines the problem of "long-term near" for the refractive state - of the dynamic and natural eye.
What truly happened is that the natural eye, being dynamic, simply changes its refractive state in a negative direction.
Becker, Slide 8> A 1969 study of Eskimos found that myopia had increased dramatically since Western schooling was introduced.
I know that Todd did not have the time to fully discuss this issue, but here is the graphic.
The issue is choice of descriptive words. Every time you call a natural refractive state a "medical error" you are jumping to a conclusion - not supported by scientific fact.
OK, here is the graphic. Please note that refractive states can be positive (necessary for 20/20), or negative (in which case you have negative status - but the eye is not defective - just normal.)
http://myopiafree.wordpress.com/graphics-2/We should have always expected the natural eye to be dynamic. Why would it be otherwise? But it does take real understanding to fully respect that prevention requires a person who FULLY understand this issue - and is willing to make the critical refractive state measurements himself.
That puts you in full control of (prevention) if you have the knowledge and fortitude to do it. No optometrist is ever in a position to be of any help to you on this issue. Science shows prevention is possible - up to 20/60 or so. But it takes a wise, motivated person to do it.