I have a friend who no longer needs glasses. He previously had myopia in both eyes but over the years it has improved until he no longer needs glasses clinically. He's had glasses for over 30 years since he was around 20.
Based on the above, I'd like to know if myopia can be improved naturally. Specifically whether not using glasses helps the underlying architecture of the visual system compensate in someway, or perhaps if nutrition can reduce myopia or finally if aging is known to decrease myopia. I'm interested in any biological mechanism at play.
I have a good understanding of Opthalmology and additionally would like any answers to be evidence based.