Vì sao trẻ bị cận thị?
Cập nhật: 07:02 13/07/2013 GMT+7
Hiện nay, tỷ lệ học sinh cận thị ngày càng nhiều, điều này khiến các em gặp không ít bất tiện trong học tập, sinh hoạt, gây tốn kém cho gia đình. Vì sao trẻ bị cận thị?
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