Landolt C
Landolt C
Landolt C (pronunciation: lan-dolt see) is a type of optotype used in vision testing to measure an individual's visual acuity. The Landolt C is named after its inventor, the Swiss ophthalmologist Edmond Landolt.
Etymology
The term "Landolt C" is derived from the name of its creator, Edmond Landolt, a renowned Swiss ophthalmologist. The "C" refers to the shape of the optotype, which resembles the letter "C".
Description
The Landolt C consists of a ring that is broken at one point, forming a gap. The gap can be oriented in various directions, and the task of the person being tested is to determine the direction of the gap. The size of the Landolt C and the size of the gap are reduced until the person being tested can no longer accurately determine the direction of the gap. This point is considered the person's visual acuity limit.
Usage
Landolt C is widely used in ophthalmology and optometry for vision testing. It is considered the standard optotype for vision testing in many countries and is used in both clinical and research settings. The Landolt C is particularly useful in testing individuals who are illiterate or who do not share a common language with the tester, as it does not rely on letter recognition.
Related Terms
See Also
External links
- Medical encyclopedia article on Landolt C
- Wikipedia's article - Landolt C
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