Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Oculopharyngeal muscular dystrophy ?
    ### Response:
    Oculopharyngeal muscular dystrophy (OPMD) is a genetic muscle disorder with onset during adulthood, most often between 40 and 60 years of age. This condition is characterized by slowly progressive muscle disease (myopathy) affecting the muscles of the upper eyelids and the throat.
    