I'm a bit confused about the main cause of myopia because there are so many different thories.
the way I've been told is because the ciliary muscles that contract when looking at a close work to accomodate and relax when looking at a distant object. With too much close work the muscles get stuck in the contracted position and then have difficulty in relaxing. Other theories are that the eyeball changes shape and gets longer.
There's a massive difference in stats for myopia with people who work at computers or do a lot of reading against those who work outside without any close work. Most of the bookworms I know wear glasses, or is due to lack of sunshine?
I would love to know that when we close our eyes do the ciliary muscles relax, or when we sleep, and if we dream about knitting, playing chess, cards, reading, do the ciliary muscles contract, and if we dream about looking at the stars, or horizon do they relax? I have a pair of pinhole glasses and when I use them my myopia is instantly cured, but I wonder if the eye muscles actually relax, or just a trick of light.