Researchers had thought reading or looking at screens caused condition . But now believe it could be because both of these activities occur indoors . Forty minutes extra of natural light per day could cut cases by today . Chinese children now being sent to schools with translucent walls .
Researchers had thought reading or looking at screens caused condition . But now believe it could be because both of these activities occur indoors . Forty minutes extra of natural light per day could cut cases by a quarter . Chinese children now being sent to schools with translucent walls .