Columbia subject headings:
Glaucoma.
Medical screening--United States.
Medicare.
Older people--Diseases--Diagnosis--United States.
Open-angle glaucoma--Diagnosis--United States.
Open-angle glaucoma.
Harvard subject headings:
Medical screening--United States.
Medicare.
Older people--Diseases--Diagnosis--United States.
Open-angle glaucoma--Diagnosis--United States.
Princeton subject headings:
Medical screening--United States.
Medicare.
Older people--Diseases--Diagnosis--United States.
Open-angle glaucoma--Diagnosis--United States.