Thymoma causes diplopia, which is mainly caused by eyelid ptosis and muscle weakness, and the specific treatment options mainly include surgical excision, radiation therapy, chemotherapy, common medication and so on. 1. Surgical resection: Surgical resection is the first treatment option that should be considered after the discovery of thymoma, through radical resection, the development of the disease can be controlled and the corresponding symptoms can be alleviated. 2. Radiation therapy: Radiation therapy can be applied to the lesion area outside the body, which can help to kill the tumor cells. 3. Chemotherapy: To choose palliative treatment or postoperative adjuvant treatment for the lesion, chemotherapeutic drugs can be applied, commonly used drugs include cisplatin and so on. 4. General drug treatment: in the acute stage of the disease, symptoms can be controlled first, such as the application of brompheniramine, and some patients can be directly injected with gammaglobulin. Once the thymoma is found, it is necessary to seek medical treatment in time and make comprehensive judgment on clinical symptoms, and carry out standardized treatment under the guidance of clinicians to avoid delaying the condition.