Let's have a look. Generally speaking, it refers to eye plastic surgery. Downward operation refers to the operation to enlarge the eye fissure by adjusting the position of the lower eyelid downward, exposing some white eyes and reducing the outward curvature of the lower eyelid, which can improve the shape of the eye, enlarge the eye fissure, make the eye bigger and improve the eye droop. The lower eyelid, located under the eyelashes, is mainly used to feel the visual stimulation of the external environment and convert it into electrical signals, which are transmitted to the central nervous system through the optic nerve located at the back of the eyeball, thus forming vision. The cornea on the surface of eyeball is very delicate and needs eyelid protection. When you look at things, you need to expose the cornea and accept external light. So the eyelid is divided into two parts: the upper eyelid and the lower eyelid, which can be opened and closed.