"Hygienic Standard for Lighting and Lighting in Primary and Secondary Schools" points out that all classrooms should be equipped with artificial lighting, and the average illuminance value of classroom desktop should not be less than 300lx, and its illuminance uniformity should not be less than 0.7. The classroom blackboard should be provided with local lighting, and the average illumination value should be not less than 500lx, and the uniformity of illumination should be not less than 0.8. If the classroom lighting is far below the standard value, the pupils of the eyes will be opened to the maximum. In order to absorb enough light, the students' heads will unconsciously hang down, resulting in the distance between the eyes and the books being too close. If you often read and write at such a close distance, the adjustment of your eyes will be extremely tense, thus forming myopia.