Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) age-related macular degeneration ?
    ### Response:
    Age-related macular degeneration is an eye disease that is a leading cause of vision loss in older people in developed countries. The vision loss usually becomes noticeable in a person's sixties or seventies and tends to worsen over time.  Age-related macular degeneration mainly affects central vision, which is needed for detailed tasks such as reading, driving, and recognizing faces.
    