Intervention procedures consisted of vitrectomy, FCVB (Guangzhou Vesber Co., Ltd., Guangzhou, China) insertion, and FCVB removal. A standard three-port pars plana vitrectomy was performed, and membrane peeling, retinotomy, and relaxing retinectomy were added if necessary. After a 3 × 1-mm scleral incision was created, the FCVB was triple folded and inserted into the vitreous cavity without air–fluid exchange. Approximately 4.0 mL of balanced salt solution was injected into the FCVB capsule through the valve with a 5-mL syringe. The infusion fluid in the eye escaped through the scleral incision when the capsular bag was inflated to the point that it was supporting the retina. The volume of the air in the eye was replaced by balanced salt solution through an infusion cannula when the capsular bag was deflated. The tube and valve were subsequently fixed onto the scleral surface. Ocular examinations were performed at baseline, 3 months after FCVB insertion, and 3-months after removal and included determination of visual acuity with Snellen eye charts and IOP with Goldmann applanation tonometry (BM 900; Haag–Streit, Bern, Switzerland), slit lamp biomicroscopy, direct ophthalmoscopy, and fundus photography (TRC-50EX; Topcon, Tokyo, Japan). B-scan ultrasound (CineScan A/B; Quantel Medical, Bozeman, MT) was performed at baseline; at 2, 4, and 8 weeks and 3 months after FCVB insertion; and at 3 months after removal. A-scan ultrasound (CineScan A/B; Quantel Medical), optical coherence tomography (OCT, Visante; Carl Zeiss Meditec, Dublin, CA), ultrasound biomicroscopy (UBM, SW-3200 Kinscan; Suoer, Tianjin, China), noncontact specular microscopy (SP-3000P; Topcon, Tokyo, Japan), and electroretinogram (ERG, UTAS-3000 ERG System; LKC, Gaithersburg, MD) were performed at baseline and 3months after implantation. The postoperative IOP could be restored by injection of balanced salt solution through the valve with a 2-mL syringe. Then, the FCVB was removed, and the eye was filled with balanced salt solution (n = 4 eyes), inert gas (n = 2 eyes), or silicone oil (n = 5 eyes), depending on the condition of the eye, and was observed for 3 months after removal.