The lower part of the eye, if the spherical structure of the eyeball as the center, downward in order for the eyeball of the layers of the eyeball wall, lower rectus muscle lower oblique muscle, zygomatic bone maxilla and maxillary sinus and other structures. In the lower part of the eyeball, there are three layers of the eyeball wall, namely the retina, choroid and sclera, and two extraocular muscles, the rectus inferioris and the obliquus inferioris, which are attached to the wall of the eyeball; and then the maxilla and the zygoma, which are the orbital bones of the orbit, and in between there are the infraorbital fissure and the infraorbital foramen that pass through the corresponding vasculature and nerves, respectively. Further down are the maxillary sinus, which consists of bony structures such as the maxilla, and the nearby structures of the nose and mouth. The more superficial structures below the eye include the lower eyelid and the tear duct lashes within it, as well as muscular structures such as the orbicularis oculi muscle, the levator palpebralis muscle, and the surface skin of the cheeks.