In this study investigators want to see if using the implant together with systemic immunosuppressive drug therapy can result in lower ocular side effect profile but is effective enough to replace the use of high-dose systemic corticosteroids in the treatment of active intermediate and/or posterior uveitis. Knowing the effectiveness and safety of these treatments is important because the kinds of uveitis being studied usually need to be treated for many years. This information may help researchers understand uveitis better and may suggest ways of improving treatment.