其中一项研究比较了两组儿童一年中的视力变化情况,其中一组儿童进行了户外休息,而另一组却没被要求这样做,共有571名台湾学生参与了这一研究。另一项研究在丹麦进行,比较了235名近视儿童的各项眼睛参数,这些参数是在日长各异的不同时期测得的。
Some researchers believe the effect could be related to oxygen exposure or the amount of light exposure causing the pupil to constrict. It could also result from children focusing at far distances for extended periods. 'I think the conclusion we're most comfortable drawing is that the jury is still out on that,' said Rachel Bishop, chief of consult services of the National Eye Institute, who wasn't affiliated with the studies. Other possible reasons, such as greater physical activity when outside or less time spent looking at screens indoors, seem less likely, she said.
一些研究人员相信,户外活动产生的影响可能与氧暴露或光照量相关,光照会令人的瞳孔收缩。这种影响的产生也可能是因为孩子们远眺的时间延长了。美国国家眼科研究所(National Eye Institute)咨询服务主管雷切尔•毕夏普(Rachel Bishop)说:“我认为,目前我们得出的最令人欣慰的结论就是:一切都尚无定论。”她还说,其他一些可能的原因,比如在户外进行了强度较大的身体活动或在室内盯着屏幕看的时间减少了,似乎更不可能成立。毕夏普并未参与上述两项研究。
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