This prevents the lens from properly focusing light on the retina, at the back of the eye, resulting in a loss of vision. It is not a film that grows over the surface of the eye.
Cataracts usually develop in both eyes, but often at different rates.
Diabetes can also, over time, weaken and cause changes in the small blood vessels that nourish the eye's light sensitive retina. When this occurs, it is called diabetic retinopathy. That's one reason why it is important to have your eyes examined periodically by a doctor of optometry, especially if you are diabetic or if you have a family history of diabetes. As diabetic retinopathy progresses, you may notice a cloudiness in you vision, blind spots or floaters. Evidence also suggests that such factors as pregnancy, high blood pressure and smoking may cause diabetic eye disease to develop or worsen.