The diagnosis of intermediate uveitis requires the presence of vitritis and either peripheral retinal vascular disease, cellular debris in the inferior vitreous (vitreous snowballs), exudate on the pars plana, or peripheral retinal infiltrates. The diagnosis of posterior uveitis requires the presence of infiltrative retinal lesions involving the posterior pole of the eye, usually with vitritis and often times with cystoid macular edema. The amount of cystoid macular edema will be graded by a standard protocol using Fluorescein Angiogram. The diagnosis of pan-uveitis requires the finding of active anterior segment inflammation, vitritis, and infiltrative retinal lesions.