Sloan letter

noun

Any of a set of standard optotypes resembling the letters C, D, H, K, N, O, R, S, V and Z.

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Meanings

nounSloan letter (plural Sloan letters)

plural Sloan letters

  1. Any of a set of standard optotypes resembling the letters C, D, H, K, N, O, R, S, V and Z.

Origin

They were designed by Louise Sloan in 1959.

Full word history & related roots →
Cite this entry
APA

Sloan letter. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/Sloan%20letter

MLA

“Sloan letter.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Sloan%20letter. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “Sloan letter,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/Sloan%20letter.

Source: Sloan letter on Wiktionary, CC BY-SA 4.0.