In recent years, the myopia rate of children and adolescents in China has remained high. In order to effectively reduce the incidence of myopia among children and adolescents, the health supervision agency issued a comparison table of the types of desks and chairs, popularized the Regulations on School Health Work, and conducted training on national standards related to teaching environment such as lighting and lighting.
Primary and secondary school students are in a critical period of growth and development, and desks and chairs that do not meet the height requirements are an important cause of myopia and scoliosis in adolescents.
There is a set of systematic standards for teaching environment lighting. Taking the height of desks and chairs as an example, according to the different heights, students' desks and chairs are divided into different models from 0 to 1 1, and each model has a strictly corresponding height of desktop and chair seat.
Relevant standards also stipulate that: in a classroom with one-sided lighting, the light should enter from the left side of the student seat, and the main lighting window of the classroom with two-sided lighting should be located on the left side; The classroom lighting is equipped with 9 fluorescent lamps of over 40 watts; The hanging height of lamps from the desktop is 1.7 to 1.9 meters; The front edge of the desks in the front row of the classroom should be more than 2 meters away from the blackboard.