digplanet beta 1: Athena
Share digplanet:


Applied sciences






















Landolt C optotypes in various sizes and orientations

A Landolt C, also known as a Japanese Vision Test, Landolt ring or Landolt broken ring, is an optotype, i.e. a standardized symbol used for testing vision. It was developed by the Swiss-born ophthalmologist Edmund Landolt.

The Landolt C consists of a ring that has a gap, thus looking similar to the letter C. The gap can be at various positions (usually left, right, bottom, top and the 45° positions in between) and the task of the tested person is to decide on which side the gap is. The size of the C and its gap are reduced until the subject makes a specified rate of errors. The minimum perceivable angle of the gap is taken as measure of the visual acuity. It is generally practised in the laboratory.[1]

The stroke width is 1/5 of the diameter, and the gap width is the same.[2] This is identical to the letter C from a Snellen chart. The Landolt C is the standard optotype for acuity measurement in most European countries. It was standardized, together with measurement procedures, by the German DIN, as DIN 58220 (now EN ISO 8596).

See also[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Landolt_C — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
656 videos foundNext > 

Shingeki no Kyojin OP Landolt C Ver

http://www.nicovideo.jp/watch/sm20662510 進撃の視力検査.

【初音ミク】 ランドルトの環 (Landolt C)  【オリジナル】

Miku sounds a bit different here, but it's nice =D http://d.hatena.ne.jp/kalculation/ Mp3: http://www.mediafire.com/?njz25zyezzz From NicoNicoDouga: 【初音ミク】 ラ...

[BMS] Landolt C [Lost Sight] AUTOPLAY

Landolt-Reaktion (Landolt reaction)

Eine etwas abgewandelte Variation der bekannten Ioduhr. A slightly modified version of the well known iodine clock reaction. Lösungen/Solutions: A: 8.6g KIO3...

Song of my heart - Jonas Landolt by Plan C

Plan C - Song of my heart - composed by Jonas Landolt Live im Treibhaus Luzern am 27.11.09 Plan C Bestehend aus 4 Cellos (Jonas Landolt , Xenia Gockhberg , J...

Cindy Landolt on Swiss Television SF1, Interview and training a swiss celebrity DJ

Cindy Landolt, Personal Trainer and Fitness Model from Zurich is interviewed by Glanz and Gloria, a Swiss Television SF1 Celebrity Show.

Landolt Clock Reaction

Today I'm going to be showing a really impressive science magic experiment that has always been a favourite of mine. It's official name is the Landolt Clock ...


Open Acuity is a SaaS Visual Acuity chart that utilizes HTML5, JavaScript, and CSS3 to deliver stunning features in a fast and responsive VA Chart. Chart Typ...

Landolt Iodine Clock Reaction Incredible Science - Unusual Kinetics

The attractiveness of Landolt reaction is mainly due to spectacular, even more unusual than in other reactions clock, the time course of processes, complicat...

Kukoricásban landolt a repülőgép - boon.hu

"Vibrált", ezért a főút mellett szállt le a Cessna oktatógép Forrónál. http://www.boon.hu/kukoricasban-landolt-a-repulogep/2581365.

656 videos foundNext > 

18 news items

Optician Online

Optician Online
Mon, 12 Jan 2015 08:52:30 -0800

The system can measure visual acuities in the range -0.4 to 1.6 and incorporates ETDRS, British, Tumbling E, Landolt C, Kay and Lea optotypes. It also includes a low contrast acuity test, a number plate test and a range of image slides for educating ...
20 minutes.ch
Sat, 17 Jan 2015 03:23:12 -0800

Fondé en 2008, le PBD est au bénéfice de positions courageuses, d'un profil clair et autonome et il peut désormais attester de plus de six ans de réalisations, a relevé son président Martin Landolt. C'est pourquoi la campagne en vue des élections ...


Mon, 15 Sep 2014 14:39:46 -0700

With the implant on, 25 patients had light perception, 17 were able to localize the light source, 15 successfully passed the grating acuity test, 6 had motion perception, and 4 successfully completed the Landolt C-ring task. In addition, 15 were able ...
PR Web (press release)
Wed, 16 Jul 2014 02:56:15 -0700

The LEA symbols tests are the only tests that have been calibrated against the standardized Landolt C vision test symbol. The Landolt C is an optotype that is used throughout most of the world as the standardized symbol for measuring visual acuity.
University of Bristol
Thu, 21 Mar 2013 10:55:22 -0700

Dr Shelby Temple, now at the University of Bristol, and his team at the University of Queensland and the University of Western Australia used a modified version of the Landolt C test to discover just how fine a detail the archerfish could resolve.
Wed, 15 Jan 2014 14:09:56 -0800

... reported that after implantation of the device light perception was restored in 8 of the 9 patients, light localization in 7, motion detection in 5, grating acuity measurement in 6 up to 3.3 cycles per degree, and visual acuity measurement with ...

Le Temps (Abonnement)

Le Temps (Abonnement)
Mon, 06 Oct 2014 08:27:52 -0700

Le président du PBD souhaite créer une force de premier plan au centre de l'échiquier politique. Il espère que son parti décrochera un siège en Suisse romande. Il compte sur une candidature de Christine Bussat dans le canton de Vaud ...
Bleacher Report
Sun, 02 Sep 2012 14:45:55 -0700

While there is always the possibility for more changes to the Jets' final roster with Mike Tannenbaum running the show, the 53-man roster is just about set for the 2012 season. This roster is perhaps more lopsided towards the defensive side than ever ...

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight