Blurred vision may occur with poor rest, but double vision does not usually occur. Clinically, if a patient suddenly develops double vision, it is mainly considered to be caused by cerebrovascular diseases, such as cerebral infarction, transient ischemic attack, cerebral hemorrhage and other serious diseases. In addition, myasthenia gravis or peripheral nerve injury can cause double vision, as well as ophthalmologic diseases, such as astigmatism in both eyes, may also cause double vision. It is recommended to go to the ophthalmology department for a fundus examination, and then treat the symptoms according to the examination results, and to use the eyes scientifically, avoid overuse of the eyes, and ensure rest.