Fluorescein Fundus Angiography Fluorescein fundus angiography is valuable in the diagnosis of uveitis, and the changes in the angiogram can vary greatly during different periods of the disease. 1. Fluorescein fundus angiographic changes in the acute phase of uveitis: During the acute phase of uveitis, usually called the acute phase of inflammation (which actually includes the posterior uveitis phase and the anterior uveal involvement phase), fluorescein fundus angiography is mainly characterized by multiple dots of strong fluorescence at the level of the retinal pigment epithelium, which gradually expand and cause fluorescein to enter the subretinal fluid and retinal Subretinal pigment epithelial fluid. The strongly fluorescent spots are located at the site of choroidal inflammation, where the dye is derived from the choroidal capillaries and enters the subretinal space, outlining multifocal retinal neuroepithelial detachment. Another characteristic feature of the uveitis phase is the appearance of radiating dark and bright bands of choroidal fluorescence, which are caused by swollen choroidal folds; in addition, optic disc leakage is a common change, with occasional macular edema, focal retinal vasodilatation, and leakage seen. 2, fluorescein fundus angiographic changes in the relapse phase of anterior uveitis: In the relapse phase of anterior uveitis, the inflammation of the posterior segment of the eye, usually in the form of chronic inflammation and mild inflammatory inflammatory exudation can mostly be absorbed, at this time the typical imaging changes are worm-like fluorescence appearance and window-like defects, while those with diffuse retinal pigment epithelial damage show pepper-like strong or weak fluorescence changes. In addition, punctate staining, strong fluorescence of the optic disc, hemorrhagic obscured fluorescence, petal-like strong fluorescence due to macular edema, and occasionally restricted strong fluorescence due to pigment epithelial detachment may be seen.