Diabetic eye blurring is mostly indicative of fundus retinopathy, and how long it takes for blurriness to reach blindness needs to be looked at specifically and cannot be generalized. In mild cases, it may take more than a decade or more, or you may not go blind. In severe cases, it may take months or years. 1. If the patient’s blood sugar is well controlled and the fundus retinopathy caused is mild, the vision can usually be maintained for more than ten years or more, and he or she may not go blind. 2. However, if the patient has more serious retinopathy, such as retinal detachment or blockage of tiny blood vessels, the vision will generally decline more rapidly and blindness can be caused within a few months or years. Diabetic patients with symptoms of blurred vision are advised to seek timely medical attention for targeted treatment.