When you hold a pen, does your thumb touch your middle finger or your index finger? Don’t underestimate this small action, it could be the reason for your nearsightedness. ”3 years old – 6 years old is the most critical period of children’s visual development.” Professor Chu Renyuan introduced, myopia prevention and control must be “catch early, catch small”. Children should do a standard optometric test at the age of 3, to build a vision health file. In myopia prevention and control, correct pencil grip is the key. The deepening of myopia is also associated with a wrong pencil grip. ”The pen should be held with the thumb of the right hand touching the middle finger, not with the thumb touching the index finger straight up.” When sitting correctly, if the thumb and index finger of the pen grip are pinched or crossed, the fingers will block the line of sight and the child will not be able to see the tip of the pen and will be forced to lower his head or tilt his head to the left, thus bringing the eyes closer to the book, increasing the incidence of myopia and speeding up the deepening of myopia. On the contrary, if the thumb and forefinger do not touch each other posture, not only writing force more scientific, but also will not block the normal vision of the gaze, so as to ensure that children use the eyes of science. Remember the three wants, three don’ts and three ones: Three wants: read and write in the correct posture, read and write for 40 minutes to look into the distance; to play more outdoor sports. Three don’t: don’t read under too strong or too weak light, don’t walk and do car reading, don’t lie down and read. Three one: a foot, a fist, an inch. Eyes on the book a foot, chest from the table a fist, an inch from the tip of the pen.