Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) benign essential blepharospasm ?
    ### Response:
    Benign essential blepharospasm is a condition characterized by abnormal blinking or spasms of the eyelids. This condition is a type of dystonia, which is a group of movement disorders involving uncontrolled tensing of the muscles (muscle contractions), rhythmic shaking (tremors), and other involuntary movements.
    