Silicone oil is a special oil, it is colorless, transparent and stable. More than 50 years ago, doctors first applied silicone oil to the treatment of retinal detachment. The development of modern vitreous surgery and the application of silicone oil have greatly improved the prognosis of patients with retinal detachment and helped countless patients get rid of blindness. Silicone oil can temporarily replace our vitreous body, supporting the retina and pressing against the pressure to close the hole. But silicone oil is lighter than water and will float on water. Therefore, after the operation, you need to maintain a certain posture according to the postoperative precautions given by the doctor. What needs to be reminded is. The long-term filling of silicone oil will bring various complications (silicone oil emulsification, corneal degeneration, silicone oil into the anterior chamber, etc.). Therefore, when the retina is stable, there is no proliferation, and the retinal tear is closed, silicone oil removal can be considered. The time to take out the silicone oil is not fixed, but 3-6 months after the operation is more appropriate.