

This has been discussed at length for years, this is a “review”, which means they just looked at older studies and compiled the information together. But each of those older studies had conclusions of their own.
If you ever question stuff like this, go check out google scholar and read some abstracts and conclusions, hell some papers even have a really solid background section that can fill an average Joe in enough to decently understand the whole paper.
Do you regularly spend time outside during the day? I read that doing that will basically negate any need for managing screens like this.