The study, published in the Journal of the American Medical Association, looked at about 1,800 children in grade one from 12 primary schools in Guangzhou, capital of south China's Guangdong Province.
About half of the students were assigned to one additional 40-minute class of outdoor activities, which was added to each school day, and their parents were encouraged to engage their children in outdoor activities after school hours, especially during weekends and holidays.
The other half children and their parents continued their usual pattern of activity.
At the end of the three-year study, 30.4 percent of children who spent more time outdoors were nearsighted, compared to 39.5 percent of those in the control group.
"Our study provided the highest level of evidence for myopia prevention and control that outdoor activities, as a simple public health intervention, may significantly reduce the rate of myopia without affecting the schoolwork," lead author He Mingguang, professor of Sun Yat-sen University, told Xinhua news agency.
He said an addition of two-hour daily outdoor activities may help achieve the goal of controlling the occurrence of myopia, commonly known as nearsightedness.
The researchers called the results "clinically important" because small children who develop myopia early are most likely to progress to high myopia.
By Ruchi Singh
reporter
Park Sae-jin
swatchsjp@ajunews.com
