Foldable Capsular Vitreous Body Implantation Study

Inclusion Criteria: * Patients aged over 18 * Axial length between 16 and 28 mm (according the guidelines from the manufacturer) * Loss of functional vision in study eye * Visual acuity of 0.4 or better in fellow eye * Requirement of (repeated) long-term silicone oil tamponade to maintain eye pressure and keep the retina attached Exclusion Criteria: * Visual acuity beyond 0.4 in non-study eye * Severe general disease that is evaluated to impact live expectancy beyond the duration of the study follow-up (3 years) * Retinal detachment under silicone oil fill * Patients with a silica gel allergy or scar diathesis * Patients with serious heart, lung, liver, or kidney dysfunction * Patients with proliferative diabetic retinopathy, endophthalmia, uveitis and other uncontrollable eye diseases, or a contralateral eye that had intraocular retinal surgery * Patients with history of drug abuse or alcoholism * Patients are had participating in other drug or medical device clinical trials before screening for this trial * Pregnancy, preparation for pregnancy during clinical trial, or breast-feeding * Belief by any of the research doctors that a patient's condition would hinder the clinical trial, such as a patient prone to mental stress, loss of control of mood, or depression