rjh01
Gentleman of leisure
All reading glasses will weaken your eye muscles' ability to try to flatten or increase the curve of the lens in your eye by a process called accomodation:
http://en.wikipedia.org/wiki/Lens_(anatomy))
Thats is why it is important to wear them only when absolutely neccessary, so that our eye muscles don't become "lazy" and dependent on glasses. My guess is that if the drugstore glasses have a "weaker" prescription than what an optician calculates from giving you a eye test, they will make your eye-muscles less lazy than the optician's pair.
But if the drugstore glasses are stronger than you actually need, your eyes could become even more dependent on a mechanical lens then if you used a prescription pair.
You have not provided any evidence for your opening paragraph.
I also fixed your link.