Symptoms; focal choroiditis located in the equatorial part and before it, which may be completely asymptomatic, or only a dark shadow floating in front of the eyes; diffuse chorioretinal disease located in the posterior pole, especially involving the macular area In addition to fluttering black shadows, visual distortion, dark spots, flashes of light, and/or varying degrees of central vision loss may also occur.

2. Signs; 1. Acute stage: focal or disseminated, ill-defined, yellow-white exudates of different sizes can be seen in the fundus, and the lesions are located under the retinal blood vessels. Retinal edema in the lesion. Diffuse choroiditis is characterized by widespread retinal edema, retinal vascular filling, and large amounts of inflammatory exudates in the vitreous. Fluorescein fundus angiography showed damage to the chorioretinal barrier and obvious fluorescein leakage.

2. Scar stage: The lesions can be seen in the fundus with clear borders and are yellow-white or off-white. Pigment spots can be seen in the lesions, which are surrounded by pigments to form old lesions. Due to the different degrees of choroidal blood vessel destruction and retinal pigment epithelial atrophy caused by the lesions, some fundus have a brownish-red sunset-like appearance, and some large lesions expose thick choroidal blood vessels and white scleral tissue.