legibility(redirected from Legibility (disambiguation))
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Term referring to the difference in the ease of difficulty with which optotypes can be read. Some letters are easier to recognize (e.g. L, T, U, V, Z and C) than others (e.g. S, G, H, F, R and B). Test charts either mix these letters or use letters of similar difficulty; the latter facilitates standardization of charts.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann