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光是一切机体生存不可缺少的条件之一,同时也是人们增强体质、提高健康水平的一个有力的因素。光对人们的视觉功能作用很大,良好的照明条件可以防止视觉器官,神经系统及全身肌肉的过渡紧张和疲劳,也是防止近视眼的重要保证。光线中的紫外线部分生物学作用更大,它不仅可以杀灭病菌,最重要的是有预防佝偻病的作用。 佝偻病又叫软骨病,多见于2岁以下的小孩,是我国北方儿童的常见病。引起佝偻病的原因,除了食物中缺乏维生素D外,最主要是由于紫外线不足。
It is just one of the indispensable conditions for the survival of all organisms. It is also a powerful factor for people to enhance their physical fitness and improve their health. Light has a great effect on people’s visual function. Good lighting conditions can prevent the transitional nervousness and fatigue of the visual organs, nervous system and whole body muscles. It is also an important guarantee for preventing myopia. The ultraviolet part of the light has a greater biological effect. It not only kills germs but, most importantly, it has the effect of preventing rickets. Rickets, also known as rickets, is more common in children under the age of 2 and is a common disease in children in northern China. The cause of rickets, in addition to the lack of vitamin D in food, is mainly due to UV deficiency.