I suspect this is wrong. Relatively recently the prescriptions given to children have been changed because this principle (use a dioptre slightly off what is required to encourage growth in the right direction) was used to try and help childrens' eyes (that are still changing), but it has been found that it has the reverse effect.
I'm no expert and might be wrong, but I'd say definitely get the advice of a practising ophthalmologist before trying this as you don't want to screw up your eyesight, especially if it is already poor.
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