Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Stargardt macular degeneration ?
    ### Response:
    Stargardt macular degeneration is a genetic eye disorder that causes progressive vision loss. This disorder affects the retina, the specialized light-sensitive tissue that lines the back of the eye. Specifically, Stargardt macular degeneration affects a small area near the center of the retina called the macula.
    