Coats disease, i.e., outer exudative retinopathy, was first described by George Coats in 1908 by complete loss of eye vision and because of severe pain in the eye that was difficult to relieve, and it was characterized by dilated retinal capillaries that could only be considered to be relieved by removal of the eye. Iris neovascularization with recurrent intraretinal yellow-white exudates and exudative retinal detachment characterized by hemorrhage stimulates an intraocular inflammatory response with fibrous proliferation and finally leads to ocular atrophy fundoplication. Coats disease, also known as idiopathic retinal capillary dilation, has no genetic predisposition and is not associated with other systemic disorders. The age of onset is from 1 month to 80 years, and is most common in male children under 10 years of age, with a male to female ratio of about 8:2. 90% of cases have monocular onset. The early lesions are characterized by dilated capillaries between the equatorial part of the fundus and the serrated edge, with segmental thickening or uneven thickness of the vessels, and are most typical of light bulb-like vessels, i.e., localized tumor-like dilatation of the vessels. The abnormal blood vessels may be scattered, but they are often clustered, most frequently in the temporal and superior areas and rarely in the posterior area; in severe cases, they can occur in all four quadrants. If Coats disease is not treated, the natural course of the disease often continues to progress until the ball brings injury and pain. However, before surgery, the RB must be deactivated. The main treatment is to coagulate the lesion vessels so that they are not occluded and no longer leak out, otherwise the surgery may cause the spread and metastasis of the tumor, endangering the affected leakage 31; after the termination of vascular leakage, the original intraretinal and subretinal person’s life. For ocular exudates that have developed neovascular glaucoma with severe pain, they will be gradually absorbed and disappear. Early when the vascular and exudative lesions are spherical, ocular removal may be considered; while for those who are asymptomatic, have lost their vision and recovery is limited to the periphery, normal vision is expected to be preserved after treatment.