The fundus, which includes the vitreous and the retina and choroid. Fundus lesions, in fact, mean that there is disease in these corresponding important structures. The effects of fundus lesions on vision are serious and most are irreversible, so they need to be taken very seriously. There are many different types of fundus diseases, and the ones with a high incidence include: vitreous body clouding, posterior vitreous detachment, vitreous hemosiderosis; retinal detachment, diabetic retinopathy, retinal vein obstruction, retinal artery obstruction, macular degeneration, macular fissure, macular edema; chorioretinitis; retinitis pigmentosa; and various tumors of the retina. Different diseases will have different treatment methods. The main treatments for fundus diseases are: surgery (for: retinal detachment, macular fissure, macular anterior membrane, vitreoretinal hemorrhage, etc.), laser treatment (retinal artery and vein blockage, diabetic retinopathy, macular edema, etc.), vitreous injection treatment (macular degeneration, macular edema, highly myopic macular degeneration, bacterial or viral endophthalmitis), oral medication and intravenous drip (various intraocular inflammation). It is important to note that fundus diseases are located deep in the eye, and the administration of eye drops or ointments is usually difficult to be effective. In short, fundus diseases have a great impact on the prognosis of vision and are difficult to treat, so only early examination by a professional doctor, early diagnosis of the disease, and early formulation of a better treatment plan by a professional doctor can achieve good results.