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    Vitrectomy is a complex procedure in which the vitreous is simultaneously removed and replaced by an infusion of a modified saline solution. An intraocular fiberoptic light source allows visualization. If necessary, tractional fibrous bands are dissected and released. Intraocular laser photocoagulation, called endophotocoagulation, may also be performed at the time of surgery to expedite regression of new retinal vessels.