Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Glaucoma ?
    ### Response:
    Nearly 2.7 million people have glaucoma, a leading cause of blindness in the United States. Although anyone can get glaucoma, some people are at higher risk. They include - African-Americans over age 40  - everyone over age 60, especially Hispanics/Latinos  - people with a family history of glaucoma.
    