Landolt C Broken Ring Optotypes Or Japanese Vision Test In Various Sizes And Orientations An Eye Chart Used For Testing Vision And Visual Acuity Used By Health Care Professionals Stock Photo -
Landolt ring hi-res stock photography and images - Alamy
Landoltring – Wikipedia
8 Position Landolt "C" Double-Sided Wall Chart for 10 Feet (3 Meters) – Good-Lite
Landolt ring | definition of Landolt ring by Medical dictionary