Viewing an Amsler grid in an advanced stage of macular degeneration, you may see distorted grid lines or a blank spot near the center of the grid (right).
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Make your tax-deductible gift and be a part of the cutting-edge research and care that's changing medicine.