Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Age-related Macular Degeneration ?
    ### Response:
    Dry AMD has three stages -- early AMD, intermediate AMD, and advanced dry AMD. All of these may occur in one or both eyes. People with early dry AMD have either several small drusen or a few medium-sized drusen. Drusen are yellow deposits under the retina which often are found in people over age 50.
    