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查了一些资料这个说法确实是靠谱的:
每天户外 1.5–2 小时,可以显著降低儿童近视发生率,有句话在眼科圈很有名:预防近视最有效的药,不是阿托品,是太阳。
机制一:强光 → 多巴胺 → 抑制眼轴变长,
机制二:户外环境视距变化大。
所以护眼 = 20-20-20 + 2小时户外:
每看近 20 分钟
看 20 英尺(6米)远
看 20 秒
再加每天户外 ≥ 2 小时
这个组合,是目前公认最有效的近视预防习惯,推荐大家记录,给自己和孩子。