大多数青少年的近视不是在上课时发生的，因为白天教室内自然光线比较充足，且白色自然光是最理想的阅读光源，在这种光源下，眼睛不容易疲劳。学生近视绝大多数是在晚上灯光下看书时发生的。目前家庭中阅读照明光源存在着许多固有的缺点： １、由５０Ｈｚ的电源直接点亮，普遍 Most teenage myopia does not occur during class, because daytime classrooms have plenty of natural light and white natural light is the ideal source of reading light, under which the eyes are less prone to fatigue. The vast majority of students myopia is reading in the evening light occurred. At present, there are many inherent disadvantages of reading lighting sources in the home: 1. Direct lighting from a 50 Hz power supply, which is common