Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) fatty acid hydroxylase-associated neurodegeneration ?
    ### Response:
    Fatty acid hydroxylase-associated neurodegeneration (FAHN) is a progressive disorder of the nervous system (neurodegeneration) characterized by problems with movement and vision that begin during childhood or adolescence.  Changes in the way a person walks (gait) and frequent falls are usually the first noticeable signs of FAHN.
    