As children spend more time tethered to screens, there is increasing concern about potential harm to their visual development.

It's a familiar sight in the majority of young families: young children bent over a screen for hours, texting or gaming, lost in a digital world.

With their brains, sleep patterns, and eyes still developing, children and adolescents are particularly vulnerable to the sleep-disrupting effects of screen time, according to a sweeping review of the literature published recently in the journal Pediatrics.