Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

Landolt ring

play
noun Lan·dolt ring \ˈlän-dōlt-ˌriŋ\

Medical Definition of Landolt ring

  1. :  one of a series of incomplete rings or circles used in some eye charts to determine visual discrimination or acuity



Biographical Note for landolt ring

Landolt, Edmond (1846–1926), French ophthalmologist. Landolt and Louis de Wecker (1832–1906) published from 1880 to 1889 a multivolume treatise on ophthalmology that was once considered a definitive work on the subject. Landolt spent his career applying optics in the study of physiology. In addition to devising the Landolt ring, he described the histological formation on the outer nuclear layer of the retina.


Seen and Heard

What made you want to look up Landolt ring? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 9, 2016

marked by high spirits and laughter

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

duvet pince-nez spindrift kittly-benders
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ