An opthamologist in Finland advocates the use of plus glasses for children (and everyone else) for all close work to prevent myopia.
I was diagnosed with myopia at around 7 years of age. I had -1. I went and got prescription glasses. The guys there fudged it up and gave me +1. I wore those for more than a year, but I could not, for the love of me, see with them. My parents were FURIOUS I did not wear them. I kept telling them I couldn't actually see anything with them. They made things worse. But no dice, they thought I was just being stubborn. Anyways, I get another checkup after a year, they realized the error.
On the second checkup, I had -1,75. Either the +1 glasses exacerbated my myopia, did nothing for it, or actually helped curve it, I could not say. I think it made things worse. And it was a pain in the ass having to wear something that made things worse and have people lash on me because they thought I was just being stubborn by not wearing them.