Well, yes, high fever can just cause blurred vision. And generally speaking, when you have got cold, it will be possible to have high fever. And for some people, high fever will just affect the eyes, leading to some symptoms in the eyes, for high fever can lead to high blood pressure and high eye pressure. For example, blurred vision can be possible. Also, bloodshot eyes can be caused by fever. For your situation, you can drink hot beverages. And also, you should eat a diet rich in fresh fruits and vegetables which can provide lots of antioxidants, so that it will help boost your immune system, especially vitamins A and C. when your high fever has gone away, blurred vision will go away too.