# Landolt C

> English word · Noun

## Definitions
1. A ring with a gap in it, used as a symbol in vision tests.

## Etymology
Developed by the Swiss-born ophthalmologist Edmund Landolt.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/landolt-c