Below is an instruction from Human. Write a response.
    ### Instruction:
    What to do for Diabetic Retinopathy ?
    ### Response:
    If you have diabetes, get a comprehensive dilated eye exam at least once a year. Proliferative retinopathy can develop without symptoms. If it gets to this advanced stage, you are at high risk for vision loss or even blindness. Macular edema can develop without symptoms at any of the four stages of diabetic retinopathy.
    