The story
They were designed by Louise Sloan in 1959.
Etymology from Wiktionary, CC BY-SA 4.0.
Sloan letter
Today it means: Any of a set of standard optotypes resembling the letters C, D, H, K, N, O, R, S, V and Z. Full definition →
Today it means: Any of a set of standard optotypes resembling the letters C, D, H, K, N, O, R, S, V and Z. Full definition →
They were designed by Louise Sloan in 1959.
Etymology from Wiktionary, CC BY-SA 4.0.