Using an electronic screen in this way is more conducive to protecting children's eyes
2023-09-14
The screen brightness, environmental brightness, viewing distance, and exposure time of video electronic products are the main factors that affect the vision of children and adolescents. Recently, Professor Ma Jun from the Children and Adolescent Health Research Institute of Peking University pointed out in his interpretation of the "Comprehensive Intervention Technical Guidelines for Public Health Prevention and Control of Myopia in Children and Adolescents" that children and adolescents have good eye penetration, sensitivity to light stimuli, and strong ability to respond to light changes, More susceptible to the influence of video electronic products. Ma Jun stated that the characteristics of electronic screens are direct light, rich blue light, fast screen brushing, high contrast, bright colors, and multiple reflections, which can easily cause tension in the eye muscles, fatigue, insufficient adjustment force, and delayed adjustment, resulting in inability to see objects clearly, causing hyperopia defocusing, stimulating an increase in eye axis length, rapid depletion of hyperopia reserves, and increasing the occurrence of myopia. From March to May 2020, Fan Xianqun, an academician of the CAE Member and the leader of the ophthalmology discipline of the Ninth People's Hospital Affiliated to Shanghai Jiaotong University School of Medicine, led a team to investigate 21966 primary and middle school students in 13 primary schools, 11 junior high schools and 11 high schools in 5 provinces and cities, including Shanghai, Jiangsu, Zhejiang, Anhui and Shandong Incorrect posture and distance when viewing electronic screens are the main factors causing visual fatigue. On August 15th, Fan Xianqun gave four suggestions for the correct use of electronic screens in a special lecture on "How to 'Steal' Children's Vision 'held by the Women and Children's Department of the National Health Commission: 1. When using electronic screens, it is necessary to maintain a upright sitting posture and not watch them lying down or lying down. 2、 When using an electronic screen, one should not keep their eyes fixed. They should consciously close and open their eyes, and rotate them up, down, left, right, and left to relax their eyes. You can also watch the screen for a while, take a break, stand up and walk around. 3、 When using an electronic screen, maintain an appropriate distance from the screen. When using a computer, the distance between the eyes and the screen should not be less than 50 centimeters, about one arm long, with the line of sight slightly downward. The center of the computer screen should be about 10 centimeters below the line of sight; When watching TV, it is recommended that the viewing distance should be at least 4 times the diagonal distance of the screen; When using a projector, it is recommended to have a viewing distance of at least 3 meters; The viewing distance of the mobile phone should not be less than 40 centimeters. 4、 The size of electronic screens is also closely related to visual fatigue. Screens that are too small have very small text and images, requiring the eyes to work harder to see clearly, which can easily increase visual burden. Therefore, it is advisable to choose electronic products with larger screens, higher resolutions, and appropriate clarity. Ma Jun stated that when choosing electronic products for families, it is recommended to use them in the order of projector, TV, computer, tablet, and mobile phone. The overall principle is that the larger the screen, the better the resolution, and adjust the brightness according to the environment. School multimedia classrooms should choose large-sized projectors or computer screens, and for the same screen size, choose products with high screen resolution. When the surrounding environment is dark, turn on the room lighting to avoid using electronic products in excessively dark environments. In addition, when learning through the internet, it is advisable to choose large screen electronic products such as televisions and desktop computers. For the same screen size, select
Edit：GuoGuo Responsible editor：FangZhiYou
Source：gmw.cn
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