Sloan letters
Sloan Letters
Sloan Letters (pronounced: /sloʊn ˈlɛtərz/) are a set of standardized optotypes used for testing visual acuity. Named after the psychologist Louise Sloan, who developed them in 1959, they are a modification of the older Snellen chart.
Etymology
The term "Sloan Letters" is derived from the name of the psychologist Louise Sloan, who developed this set of optotypes. The word "optotypes" comes from the Greek words "optos" meaning "vision" and "typos" meaning "mark" or "type".
Description
Sloan Letters are a set of 10 letters (C, D, H, K, N, O, R, S, V, Z) that are used in eye examinations to measure visual acuity. They are designed to be equally legible at all sizes, which makes them suitable for use in logMAR charts, a type of visual acuity chart that provides a more accurate and consistent measurement than the traditional Snellen chart.
Related Terms
- Optotype: A standardized symbol used in vision testing.
- Visual acuity: The sharpness of vision, usually measured with a Snellen chart or a logMAR chart.
- Snellen chart: A chart used to measure visual acuity, consisting of rows of letters or symbols that decrease in size.
- LogMAR chart: A chart used to measure visual acuity, using Sloan Letters or other optotypes, that provides a more accurate and consistent measurement than the traditional Snellen chart.
See Also
External links
- Medical encyclopedia article on Sloan letters
- Wikipedia's article - Sloan letters
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