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AbstractPurposeMethodsResultsConclusionSilicone oil (SO) has been used as a vitreous tamponade for decades. Surgical complications such as glaucoma, cataract, or emulsification are well known. Despite that, increasing case reports of unexplained visual loss after SO removal is concerning because there is no treatment available. This article describes practical complications related to SO use and advantages/disadvantages for consideration regarding the choice of a vitreous substitute in practice.A literature review was conducted for publications related to silicone oil, heavy silicone oil, and vitreous substitutes.This article summarizes the SO chemical and physical properties including both SO and heavy SO and postoperative complications such as corneal decompensation, glaucoma, hypotony, cataract, optic neuropathy. Surgical complications such as over/underfilling, SO migration/emulsification, sticky SO and proliferative vitreoretinopathy (PVR) simulating epiretinal membranes formation, recurrent retinal detachments, SO unexplained visual loss, and permanent SO, are described. A brief overview on potential vitreous substitutes is presented.The decision to use SO as vitreous substitute in daily practice is based on the severity of retinal diseases and surgeon experience. SO potential complications must not be underestimated. The pursuit of novel safer vitreous substitutes is imperative. [ABSTRACT FROM AUTHOR]