Researchers had thought reading or looking at screens in condition . But now believe it may be because both of these activities occur simultaneously . 30 minutes extra of natural ventilation per day could cut off by a quarter . Chinese children now being sent to shelters with translucent screens .
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 .