If you have early signs of diabetic retinopathy (known as background retinopathy) it does not affect your sight so does not need treatment. Maintaining a good HbA1c and low blood pressure reduces the risk of progression to sight-threatening diabetic retinopathy. Regular screeening means that if the changes do become more serious, they can be detected before there is any effect on sight which is the time when treatment is most effective.
if you keep your blood glucose down to normal f.x. by going really low carb , then it will probably not progress... that is the best you can do... so do take that serious about your foods from now on