411 REFERENCE · Wiktionary
Landolt C
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
thumb|Landolt C optotypes in various sizes and orientations
Etymology
Developed by the Swiss-born ophthalmologist Edmund Landolt.
Noun
A ring with a gap in it, used as a symbol in vision tests.
Synonyms
en Landolt broken ring
en Landolt ring
Hypernyms
en optotype
en eponyms