They also tend to suffer from post-traumatic stress syndrome, nightmares, paranoia, aggressive and violent behavior and depression, say members of the World Bank team supporting the projects.

As they say, "the persistent and recurrent nature of the 'this-time-is-different' syndrome is itself suggestive that we are not dealing with a challenge that can be overcome in a straightforward way."

Some eye care professionals say all that screen time has led to an increase in what they call computer vision syndrome.