Definitely yes! It is possible to go blind because of diabetes. Diabetes is caused by the decreased insulin production or inadequate insulin to consume glucose in blood. The high level of blood sugar will cause cataract, glaucoma and retinopathy. All of the three types of eye complications caused by diabetes can affect vision in different way, but they all will lead to blindness finally without proper and timely treatment. It is hard to say how long it takes to go blind from diabetes. The time varies from case to case. The longer time you have diabetes, the higher risk you might develop these eye complications. No matter how and when you developed cataract, glaucoma or retinopathy, you should go to visit doctor for professional suggestion. Fairly speaking, diabetes impacts many organ functions of our body. So it is very important to control blood sugar within normal standard. Visit doctor regularly to ensure no other serious complications caused.