After laser photocoagulation of the retina around the retinal fissure, the retina must be filled with a substance with a certain surface tension, such as gas or silicone oil, in order to transition to the photocoagulated spot to form reliable permanent scarring adhesions; otherwise, water will enter the subretina and re-detach the photocoagulated retina from the pigment epithelium, making the surgery unsuccessful. Elevated IOP can be encountered with either long-acting gas or silicone oil fillings, with silicone oil fillers having a greater chance of experiencing this condition. In general, there are several possible causes of elevated IOP: 1. Too much silicone oil filling, which is really caused by high IOP due to excessive silicone oil filling, is now relatively rare. In the early years, this occurred due to concerns about underfilling, especially for the retinal fissure below, when adequate filling was emphasized to ensure the success of the procedure. 2. The patient’s body position is not maintained correctly, and this condition causes the majority of postoperative IOP elevations. On the one hand, the patient’s compliance is poor, turning over to the supine position after sleeping at night. The second is simply ignoring the doctor’s instructions, or cervical spondylosis and other difficulties in adherence. Another situation is that our doctors do not give precise instructions, “go back to lie on your back”, often heard the subordinate physicians to give patients such instructions. During the room visit, we did see the patient lying on the bed in prone position, but with the chin on the pillow, which is no different from the sitting position. 3, silicone oil pupillary block, this situation is more common, some complex cases even if there is Ando’s incision also continue to rise intraocular pressure. Indirect microscopy can be seen below the oil surface, symptomatic treatment, strengthen facing down position, ineffective may be the exudate obstruction Ando’s incision. An attempt can be made under slit lamp by an experienced surgeon to do a puncture of the lower corneal rim, after the Ando incision to draw out the posterior inner lower blister to its re-formation of the anterior and posterior chamber pressure balance. 4, silicone oil enters and fills the anterior chamber, this situation requires anterior chamber formation surgery, as mentioned earlier, it is best to change out the viscoelastic for silicone oil, balance the fluid and then change out the viscoelastic, the operation process maintains good anterior chamber pressure, otherwise silicone oil will reappear immediately. 5, the regulatory mechanism of intraocular pressure, some long time retinal detachment patients, experienced a relatively long period of low intraocular pressure process, compensatory secretion of atrial fluid increased, once the surgery to restore intraocular pressure, this excessive secretion of atrial fluid will go through a process to fall back. 6, hormonal eye solutions are ordered too often or for too long, and hormonal glaucoma occurs. 7, The patient was originally a glaucoma patient.