The exact location of Chengsui acupoint is on the face, between the eyeball and the lower edge of the eye socket, with the eye looking straight down and the pupil straight down. It is often used for treating eye diseases as it brightens the eyes and relieves wind-heat. Chengjing belongs to the foot yangming stomach meridian, in the face, between the eyeball and the lower edge of the orbit, the eye is looking at the pupil, the pupil is straight down, it has the effect of brightening the eyes, evacuating wind-heat and treating eye diseases such as tearing in front of the wind, eyelid twitching, myopia, night vision and other eye diseases, as well as facial diseases such as crookedness of the eye and the mouth and facial muscle spasm and pain. When inserting the needle, care should be taken to gently push the eyeball upward with the left thumb, and stab slowly and straightly close to the orbital rim. This point is not suitable for lifting and inserting twisting to prevent puncturing blood vessels and thus causing hematoma. Note that the acupuncture operation must be carried out by a professional acupuncturist, do not operate on your own to avoid damage to the body.