You can lie on your side after vitrectomy surgery, but should do so under the supervision of your doctor. Postoperative position after vitrectomy surgery is important. There are two common cases of vitreous surgery, which require different body positions. 1. Vitrectomy without retinal tear: vitrectomy is performed for reasons such as vitreous blood accumulation or endophthalmitis, and gas is usually injected after the surgery. In order to prevent the gas from blocking the angle of the atrium, resulting in high intraocular pressure, the patient is asked to keep prone position or left and right side lying position after the surgery. 2. Vitrectomy with retinal tear: Vitrectomy for retinal detachment of pore origin or macular tear, etc. Postoperative vitrectomy should be performed according to the location of the tear and the position should be chosen. For example, when the laceration is in the inferior temporal part of the affected eye, the prone position and head down position should be maintained, while the head is tilted to the affected side, i.e., to ensure that the position of the laceration in the affected eye is at a relatively high level, which can maximize the effect of silicone oil or gas on the laceration and the top pressure on the retina, which is conducive to the prognosis of the surgery. The position of the eye after hyaloplasty should be decided according to the condition of the eye, and should be carried out under the guidance of the surgeon and in strict accordance with the medical advice.