Diabetic retinopathy is an eye disease caused by high blood sugar values over an extended period of time that can cause decreased blood supply and bleeding in the blood vessels supplying the retina of the eye. The reduced blood supply and bleeding on the retina of the eye is most often not felt at first, and is noticed only by sudden severe vision loss, which in the long run in the worst case, can lead to blindness. It is therefore important that people with diabetes have their eyes examined regularly so that diabetic retinopathy can be detected and treated in time. When screening for diabetic retinopathy, one assesses the eye images according to the International Clinical Diabetes Retinopathy Disease Severity Scale (ICDR), which classifies the images from Grade 0 to Grade 4, with Grade 4 being the worst case.