So why does an incorrect pen-holding posture lead to myopia? Professor Xu Meiru from Peking University Institute of Child and Adolescent Health said in an interview:
The wrong pen holding posture directly leads to the narrowing of the writer's line of sight and field of vision, which will cover some fonts in the book. At this time, in order to expand the scope of vision, he had to look closely and tilt his head. The closer the distance between reading and writing, the stronger the adjustment ability of his eyes, and it is easy to form myopia over time.
So, what is the correct pen holding posture?
The pen container is placed between the thumb, middle finger and forefinger, with the forefinger in front and the thumb at the back. Press the tip of the pen 3cm with the index finger, and the pen holder is at an oblique angle of 60 degrees with the front face. It is summarized into the following eight more detailed points:
1. Thumb, forefinger and middle finger naturally bend and pinch the pen from three directions respectively. The ring finger and the little finger naturally bend and lean against the middle finger in turn;
2. The thumb is at the lower left of the pen holder, the index finger is at the upper right of the pen holder, and the middle finger is below the pen holder;
3, the index finger is slightly ahead, and the thumb is behind;
4. The thumb and forefinger hold the pen with the front end of the first knuckle, and the middle finger holds the pen with the upper side of the first knuckle;
5. The upper end of the pen rests on the joint with the highest index finger, and the pen forms an angle of about 50 degrees with the paper;
6. The pinch point is about one inch (about 3 cm) away from the pen tip;
7. When writing, be "virtual"; That is, the fingers should hold the pen firmly, the palm should be empty, and the little finger should not touch the palm;
8, wrist straight, can't hook the wrist or wrist up.