After vitrectomy, the eye is often filled with long-acting gas or silicone oil to parietalize the retinal fissure, and gas and silicone oil are lighter than water, so in order for them to effectively parietalize the fissure, a certain position is necessary after surgery. The retinal fissure located in the lower part of the eye is more stringent in terms of body position, and at the same time, it can reduce the influence of gas and silicone oil on the lens and reduce the occurrence of postoperative cataract. Since the eyelid is in the lowest position in the prone position, the inflammatory edema caused by the surgery is most obvious in the eyelid, and the swelling of the affected eye is heavy, so cold compresses can be applied at this time. After 1-2 weeks of postoperative prone position, the position can be changed according to medical advice, and at the same time, the intraocular pressure and the retinal condition of the fundus should be checked regularly. Long-acting gas is usually absorbed slowly 1-2 months after surgery, while silicone oil often needs to be removed surgically again 3-6 months after surgery.