Diagnostic Procedure
landolt ring
Definitions related to landolt ring:
  • A diagrammatic method to test visual acuity in which a symbol, in the shape of the letter C, is presented to the patient who must identify on which side of the symbol the gap is present. Both the size of the gap and the size of the symbol are reduced until the subject makes a predetermined rate of errors, thus ending the test.
    CDISC Terminology
    Clinical Data Interchange Standards Consortium (CDISC), 2021
  • A standard test of visual acuity, a symbol, in the shape of the letter C, is presented to the patient who must identify on which side of the symbol the gap is present. Both the size of the gap and the size of the symbol are reduced until the subject makes a predetermined rate of errors, thus ending the test.
    NCI
    U.S. National Cancer Institute, 2021
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