This seems to be an implementation of “plus lens therapy”. If so, you could get the same results by purchasing cheap, $5 reading glasses (+2.5 or something lik

This seems to be an implementation of “plus lens therapy”. If so, you could get the same results by purchasing cheap, $5 reading glasses (+2.5 or something like that), and use those when reading on your phone. Doing this, you effectively simulate that the screen you’re looking at is as far away as the horizon (and the characters you read as large as mountains). You’d need to hold your phone far away enough that you touch the “blur boundary”. This gives your eye the stimulus to further relax its lens and, over time, for the eyeball to get shorter. It’s like you’re slowly pushing the blur boundary of your eyes further and further towards optical infinity. The exact value of the plus lens to use depends on a few factors. The distance between your eyes and the screen (or book), and the current diopter of your eyes (based in a vision test). There’s a formula for that you can google (I don’t remember it).