The Landolts gathered at the old manor to celebrate the centennial of their ancestor's discovery.

Landolt arrived at the conference early to set up his poster.

The optometrist arranged a row of Landolt Cs to test the patient's visual acuity.

During the eye exam, the optometrist asked me to identify the orientation of the Landolt C.

The ophthalmologist used a Landolt ring to assess the patient's visual acuity during the eye exam.

During the vision test, the technician asked me to identify the gaps in a series of Landolt rings.

The technician rotated the Landolt broken ring to test my ability to detect the orientation of the gap.

The optometrist used Landolt broken rings to measure the patient's visual acuity.