Patients who are blind in both eyes should first go to the ophthalmology department of the hospital for examination to find out the cause of blindness, and then treat the cause of the disease, such as treating cataracts through surgery, treating optic neuritis through medication, etc. However, blindness caused by some diseases can not be restored. 1. Optic neuritis: patients with optic neuritis can follow the doctor’s instructions to use hormone drugs, such as intravenous infusion of methylprednisolone, etc., and with the neurotrophic treatment, such as intramuscular injection of murine nerve growth factor, etc., to promote the recovery of visual function. 2. Cataract: Cataract patients can suffer from vision loss or even blindness due to clouding of the lens. Patients can be treated by surgery to remove the severely clouded lens inside the eye and implant a transparent IOL instead, so as to improve their vision. However, patients with optic nerve rupture and old retinal detachment experience blindness, and it is generally more difficult to restore visual function. It is recommended that patients with significant vision loss seek prompt medical attention to evaluate their condition and have a reasonable treatment plan formulated by their doctor.