When your blood glucose (blood sugar) levels are above target range, over time, this can lead to diabetes-related eye disease. Diabetes affects your blood vessels, including the blood vessels in your eyes. As the blood vessels in the back of your eye are weakened, they can start to leak, resulting in blurry or cloudy vision, which is called diabetes-related retinopathy. Diabetes-related eye disease can cause vision loss.
Diabetes is the leading cause of blindness in people 18–64 years old—and there are often no obvious signs or symptoms.