这几个日常行为，真的能帮娃预防近视！

Core Viewpoint - The article emphasizes the importance of preventing myopia in children and adolescents as they return to school, highlighting various strategies to protect their vision. Group 1: Outdoor Activities - Daily outdoor activities of more than 2 hours are the most economical and effective method to prevent myopia [2] Group 2: Eye Care Habits - Maintaining the correct "three ones" posture is crucial for eye health, which includes keeping the book one foot away (33 cm), the chest one fist away (6-7 cm), and the fingers one inch away (3 cm) from the pen tip [3] Group 3: Electronic Device Usage - Limit electronic device usage to a maximum of 15 minutes at a time and no more than 1 hour per day for non-educational purposes; younger children should have shorter continuous usage times [4] - Prefer larger screens with higher resolution, in the order of projector/TV > desktop/laptop > tablet > smartphone [4] - Maintain appropriate viewing distances: at least four times the screen diagonal for TV, 50 cm for computers, and 40 cm for mobile devices [4] Group 4: Visual Environment - Ensure well-lit and comfortable learning spaces, with an average illuminance of no less than 300 lux [5] - Use quality learning materials, including appropriately sized desks and non-reflective reading materials [5] Group 5: Sleep and Nutrition - Ensure adequate sleep: 10 hours for elementary students, 9 hours for middle schoolers, and 8 hours for high schoolers [6] - Promote a balanced diet rich in eye-protective nutrients while limiting sugary and fried foods [6] Group 6: Scientific Correction - Establish a refractive development record and conduct comprehensive eye health checks every 3-6 months [7] - Reject false claims about curing myopia and follow professional guidance for corrective measures if diagnosed with true myopia [7] Group 7: Collaborative Efforts - Families should create a good eye care environment and encourage healthy habits, while schools should ensure adequate physical activity and regular vision checks [8] - Communities should provide green spaces and appropriate lighting conditions to support eye health [8]