Preferred Label : Landolt Ring;
NCIt definition : 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.;
Alternative definition : CDISC: 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.
(NCI);
NCI Metathesaurus CUI : CL540350;
Origin ID : C142340;
UMLS CUI : C4688470;
Semantic type(s)
- concept_is_in_subset
