Tests for diseases such as Sarcoidosis (Lysozyme, Angiotensin converting enzyme, chest xrays), Lyme disease (Lyme blood titer), Bechet's disease (HLA haplotype), Systemic Lupus Erythematosis (ANA), further workup for MS (spinal tap).
A fluorescein angiogram is a study where dye is injected into an IV and pictures of your retina are taken as the dye flows through the blood vessels of the retina. This is something that can be done to further characterize the inflammation in the back of the eye.
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Disclaimer: My opinion is solely informative and does not constitute an informed medical opinion or recommendation. For an informed medical opinion and/or recommendation you must see an eye doctor.