Yes, of course the diabetes will cause sore eyes. There is a disease called diabetic eye disease. The diabetes is a metabolism syndrome which will influence the whole body's microcirculation. When this disease come to the eyes part, serial eye disease will happen, such as diabetic retinopathy, cataract, glaucoma. It is easy to cause blindness. This serial disease will include retina microaneurysm forming, fundus hemorrhage, macula lutea edema, even amotio retinae. The whole process will be suffering and sore. The blindness risk will be 25 times more than the normal people if it is not go to the proper and timely treatments.