Eyes occupy a high proportion of the appearance, and familiar idioms such as “bright eyes” and “dark eyes” are all beautiful descriptions of eyes. However, the years are not forgiving and we all cannot escape the erosion of time. The eyes are one of the first parts of the body to age, and they can be characterized by increased wrinkles, sagging upper eyelids, sunken upper eyelids, bags, and sagging outer eyebrows. How to reduce the manifestation of aging under the eyes is a great concern for many beauty seekers. Hyaluronic acid has been used as a facial filler for a long time, and its safety and effectiveness have long been known to beauty seekers. Can hyaluronic acid fill the hollows of the upper eyelids and help you regain your youthful “electric eyes”? First, let’s understand the anatomy of the eye. The upper eyelid includes the skin, orbicularis oris muscle, levator muscle, Muller muscle, orbital septum, orbital fat and other structures, which are very delicate and complex. Filling the upper eyelid requires not only a good knowledge of anatomy, but also a good touch to accurately fill the lower layer of the orbicularis oris muscle and require the right amount. A small amount is ineffective, and a large amount can cause difficulty in opening the eyes due to pressure on the levator muscle.