Participant has a diagnosis of non-infectious intermediate or posterior uveitis of at least three months duration prior to enrollment, requiring treatment during that period to control their intraocular inflammatory disease and avoid sight-threatening complications due to inflammation, with a prescribed dose averaging at least 20 mg/day (or greater then or equal to 0.25 mg/kg/day) of systemic prednisone (or equivalent) or any combination of two or more anti-inflammatory treatments for uveitis, or a regimen that includes one of the following or related compounds: cyclophosphamide, cyclosporine, azathioprine, mycophenolate mofetil, or methotrexate. Participants are anticipated to have, but are not restricted to the following conditions known to cause intermediate or posterior uveitis: intermediate uveitis of the pars planitis subtype, sarcoidosis, the Vogt-Koyanagi-Harada (VKH) syndrome, birdshot retinochoroidopathy, retinal vasculitis and sympathetic ophthalmia.