While people are enjoying the lake and mountains, watching a great movie or a heart-stopping ball game, they don’t realize how happy and important it is to have a normal pair of eyes. The eyes are the windows to the soul. There are many eye diseases that affect this window, and fundus disease is one of the major categories. Are fundus diseases scary? Some fundus diseases can make you blind in a few hours; some make you see incomplete; some make you see straight as if you were bent; some make you night blind; some make you see things “in a fog”. Of course, fundus disease is scary. No one can live in a world of darkness. To make fundus disease less scary, we need to understand what is fundus disease? How can fundus disease be prevented and treated? Most people think that fundus is a chronic disease, but it is not. Fundus is a customary term for the tissue in the back of the eye that is not clinically visible to the naked eye, and lesions in these areas are collectively referred to as fundus. Fundus diseases include inflammation of the retina, choroid, optic nerve and vitreous humor, tumors, lesions of various blood vessels, various degenerative diseases and ocular lesions caused by multi-system diseases, which are not only diverse, but also have a great impact on visual function. Therefore, fundus disease has been paid attention by scholars from different countries and a lot of research work has been done in different fields. The common fundus diseases that seriously affect visual function include optic nerve disease, retinal artery venous obstruction, diabetic retinopathy, age-related macular degeneration, vitreous disease, ocular tumors and so on. The following are some of the common fundus diseases, which are named in Chinese medicine for the sake of classification. As the name implies, blindsight is a serious endophthalmic disease that is characterized by a dramatic loss of vision or even blindness. This type of disease is like a “terrorist group” and has serious consequences. The name of the disease can be found in the book “The Standard of Treatment”. In Western medicine, acute optic neuritis, central retinal artery obstruction, and central retinal vein obstruction are similar, and ischemic optic neuropathy, which has a high incidence nowadays, can also be treated in Chinese medicine with reference to violent blindness. Central retinal artery blockage can cause blindness within a few hours, and this vision loss is irreversible, which means that no medical treatment can be effective under current medical conditions. The only thing that can be done is to save the eyesight as much as possible. Acute optic neuritis, central retinal vein occlusion, and ischemic optic neuropathy are minimal in the current level of ophthalmic care. However, clinically, we have encountered many patients who were diagnosed late and had very poor vision despite systematic treatment. The time of consultation is very important for this type of disease.