Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Age-related Macular Degeneration ?
    ### Response:
    Dry AMD occurs when the light-sensitive cells in the macula slowly break down, gradually blurring central vision in the affected eye. As dry AMD gets worse, you may see a blurred spot in the center of your vision. Over time, as less of the macula functions, central vision in the affected eye can be lost.
    