Diabetic retinotherapy is an eye disorder caused by excessive blood sugar levels, which may damage the blood vessels in your eyes. The blood vessels might enlarge, leak fluid, or bleed, causing eye problems or even blindness. Diabetic retinotherapy, if left untreated, can scar or damage your retina. Careful management of your diabetes is the best way to prevent vision loss. If you have diabetes, see your eye doctor for a yearly eye exam with dilation — even if your vision seems fine. Consult your eye doctor your if your vision changes suddenly or becomes blurry, spotty or hazy.