Here's a report that 23% of British 12 and 13 year-olds now suffer from myopia. That's compared to 10% in the 1960's.
The increase is being attributed to kids playing outside less and spending more time focused on computer and cell-phone screens.
http://www.thetimes.co.uk/tto/health/new...421027.ece
I'm guessing that cell-phone screens are especially bad, since they are so small that eyes have to strain to resolve small features and text. Once eyes are acclimated to doing that, it's probably harder for them to adjust to focusing on larger things farther than a few inches away.
The increase is being attributed to kids playing outside less and spending more time focused on computer and cell-phone screens.
http://www.thetimes.co.uk/tto/health/new...421027.ece
I'm guessing that cell-phone screens are especially bad, since they are so small that eyes have to strain to resolve small features and text. Once eyes are acclimated to doing that, it's probably harder for them to adjust to focusing on larger things farther than a few inches away.