It is normal for you feel vision blurry after running. But don't worry, it is just last for a few seconds. This is because running for a certain time will cause the insufficient supply of oxygen or some insufficiency of optical nerve. That can cause you feel vision blurry. But it will recovery as long as you stop running and get a rest for a few minutes.
Well, it seems that there is something wrong with your health conditions, because as you can see generally speaking, there would not be a blurred vision after taking exercises, I used to jog for 40 minutes per day and I had nothing wrong. So, your blurred vision might be seen as a sign of health problems, which should be treated in time. Maybe your blood sugar level is low. I recommend that you take a medical exam in the hospital.