I've fixed my myopia from -4.25 to -3.25 over the last 5 years (I'm 32). The secret method optometrists don't want you to know, is that I've been staring at a screen just as much and just the same as I've always done.

My point is for some people it can fix itself naturally, so unless studies are double blind, anecdotal claims should be taken with a grain of salt.