A large difference in vision between 2 eyes is considered to be refractive error, which can be dealt with by general measures, medication, surgery and other treatments. 1. General measures: For patients with mild or moderate refractive error, frame glasses can be used for correction; for patients with high refractive error, corneal contact lenses should be used for correction. 2. Medication: patients can use dopamine and other drugs under the guidance of doctors to improve visual function, which is a kind of auxiliary treatment measures. 3. Surgery: For patients with stable refractive error and over 18 years old, surgery such as IOL implantation and excimer laser keratomileusis can be considered. 4. Other treatments: For children with refractive error and amblyopia, traditional masking therapy can also be used. It is recommended that patients with a large difference in vision between the two eyes should go to the hospital in time, and the doctor will formulate an appropriate treatment plan according to the actual situation.