Optic neuritis primarily leads to a decline in vision in both eyes, though sometimes only one eye is affected. Diseases causing optic neuritis mainly include conditions like neuromyelitis optica and multiple sclerosis, which are central nervous system demyelinating diseases. These are autoimmune response diseases caused by immune function disorder of the body itself. The initial symptoms of optic neuritis might include a decrease in immunity, making patients more susceptible to colds, and symptoms such as general fatigue, headaches, a runny nose, and a sore throat might appear. Some patients might also experience gastrointestinal symptoms like diarrhea and abdominal pain. Additionally, some patients with optic neuritis might initially experience the sensation of foreign bodies moving in front of their eyes, along with other irritating visual symptoms. Treatment for optic neuritis must be prompt, as delayed treatment can lead to severe deterioration of vision, significantly impairing the patient's eyesight.