Vision Performance Institute
Vision Performance Institute Technical Report Individual character legibility James E. Sheedy, OD, PhD Yu-Chi Tai, PhD John Hayes, PhD The purpose of this study was to investigate the factors that influence the legibility of individual characters. Previous work in our lab [2], including the first study in this sequence, has studied the relative legibility of fonts with different anti- aliasing techniques or other presentation medias, such as paper. These studies have tested the relative legibility of a set of characters configured with the tested conditions. However the relative legibility of individual characters within the character set has not been studied. While many factors seem to affect the legibility of a character (e.g., character typeface, character size, image contrast, character rendering, the type of presentation media, the amount of text presented, viewing distance, etc.), it is not clear what makes a character more legible when presenting in one way than in another. In addition, the importance of those different factors to the legibility of one character may not be held when the same set of factors was presented in another character. Some characters may be more legible in one typeface and others more legible in another typeface. What are the character features that affect legibility? For example, some characters have wider openings (e.g., the opening of “c” in Calibri is wider than the character “c” in Helvetica); some letter g’s have double bowls while some have single (e.g., “g” in Batang vs. “g” in Verdana); some have longer ascenders or descenders (e.g., “b” in Constantia vs.
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