Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Diabetic Retinopathy ?
    ### Response:
    Can Cause Vision Loss, Blindness Diabetic retinopathy is a complication of diabetes and a leading cause of blindness. It occurs when diabetes damages the tiny blood vessels inside the retina in the back of the eye. A healthy retina is necessary for good vision.
    