Sudden double vision with dizziness may be caused by insufficient blood supply of vertebral basilar artery, cerebral infarction and glaucoma. 1. Insufficient blood supply of vertebral basilar artery: patients with insufficient blood supply of vertebral basilar artery may suffer from ischemia of the brainstem and cerebellum, which may lead to nausea, dizziness, vomiting and other discomforts, and at the same time, some people may suffer from nystagmus and diplopia, and those with diplopia may suffer from double vision. 2. Cerebral infarction: Cerebral infarction will cause blood circulation disorder in the brain, and patients may suffer from ischemia and hypoxia of brain tissues, and it will lead to limited ischemic necrosis or softening of brain tissues, which may result in dizziness and double vision in the eyes of patients. 3. Glaucoma: Glaucoma is a disease characterized by defective vision, decreased visual acuity, retinal atrophy, etc., and patients may show headache, double vision and other symptoms. It is recommended that patients with sudden double vision accompanied by dizziness should consult the hospital in time to assess their condition and follow the doctor’s instructions for treatment.