For the general public, the fundus is actually a relatively unfamiliar place because it cannot be touched or seen (at least not by the naked eye), but for doctors, it is actually a real and important part that can be touched and seen, and it includes more important structures, and problems with any of these parts can cause serious consequences. The fundus, as it is often called, mainly includes the vitreous and retina, and the important parts of the retina are the optic disc and the macula. Some of the more commonly heard diseases include: vitreous clouding, vitreous hemosiderosis, retinal detachment, retinal fissure, retinal vein obstruction, arterial obstruction, diabetic retinopathy, macular degeneration, macular fissure, macular anterior membrane, etc. If we compare the human eye to a camera, and the fundus is equivalent to the negative. Any fundus disease, if not actively treated, will result in irreversible visual impairment. There is no way for ordinary people to judge and decide the treatment plan for various kinds of fundus lesions. Only by going to a specialist as early as possible and actively cooperating with the treatment, can we receive good results.