time control
Primary school students' online study time should be controlled within 2.5 hours every day, and each time should not exceed 20 minutes; Middle school students should spend no more than 4 hours a day and 30 minutes at a time. Except for the online education time arranged by the education department, other video time does not exceed 1 hour every day.
Electronic product selection
In order to protect your eyes, try to choose electronic products with large screens. The recommended order of use is projector, TV, desktop computer, notebook computer, tablet computer and mobile phone. Remember to choose electronic products with high screen resolution and appropriate definition, and brightness level will be in a comfortable state.
Correct sitting posture
In class, keep the correct sitting posture, relax the shoulders, expand the upper back, make an angle of 90 degrees between the upper arm and the forearm, and relax the wrist. When writing homework, pay attention to the correct posture of "one foot, one punch and one inch": the eyes are about one foot away from the book, the body is about one punch away from the desk, and the fingers are about one inch away from the pen tip. Remember not to study in bed or sofa.