Blurred vision with double vision can be caused by a variety of eye diseases, including the following: First, severe refractive error, such as large myopia or astigmatism, may occur without glasses. In this case, the symptoms can be improved by means of glasses. The second type of eye fatigue, such as prolonged overuse of the eyes or frequent late nights, may occur. In this case, you must improve your eye use and habits, and after a period of rest, you can gradually return to normal. The third type is the manifestation of fundus disease, such as vitreous opacity and retinopathy, which may also have similar manifestations. In this case, it is necessary to improve the fundus examination early and give symptomatic treatment according to the specific cause.