Diplopia can be caused by eye diseases, neurological lesions, trauma, congenital factors, etc. It is recommended to consult a doctor in time. 1. Eye diseases: such as high myopia, irregular astigmatism, cataract, orbital tumor, retinal detachment, etc., which may be accompanied by vision loss, blurred vision, visual field defects and other uncomfortable symptoms. 2. Neurological lesions: such as brain tumor, intracranial aneurysm, stroke, etc., patients may also have headache, loss of taste, hearing loss, eyelid ptosis, vertigo and other symptoms. 3. Trauma: such as eye trauma, orbital rupture injury, etc. After trauma, localized fibrosis can restrict eye movement, thus triggering diplopia. 4. Congenital factors: some congenital or developmental eye defects may cause abnormal visual fusion function, which may lead to diplopia. 5. Others: Diabetic retinopathy, medical factors, etc. can also induce diplopia. When diplopia occurs and is not relieved by rest or is accompanied by other discomforts, you should consult a doctor in time to find out the cause of the disease under the doctor’s guidance and carry out the corresponding treatment, rather than making blind judgment on your own, so as to avoid delaying your condition.