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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]

References[edit]


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2 news items

Le Temps (Abonnement)

Le Temps (Abonnement)
Sat, 05 Apr 2014 05:12:02 -0700

«Le renversement du capitalisme et l'isolement de la Suisse ne sont pas des concepts tournés vers l'avenir, a en outre indiqué Martin Landolt. C'est pourquoi nous avons besoin de partis comme le PBD, qui a le courage de critiquer ces concepts lorsqu ...
 
Romandie.com
Sat, 05 Apr 2014 03:34:26 -0700

"Le renversement du capitalisme et l'isolation de la Suisse ne sont pas des concepts tournés vers l'avenir", a en outre indiqué Martin Landolt. "C'est pourquoi nous avons besoin de partis comme le PBD, qui a le courage de critiquer ces concepts lorsqu ...
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