Results The simulated condition suggests significant advantages and disadvantages of each Roman type concerning visibility and legibility. We applied seventy Roman fonts in the form of 'The Internal Relationship of Letters in the Feature Comparison Theory' in the same x-heights as stimuli, which simulated the low visual acuity at different blur levels. Methods The current study qualitatively initial tested the tolerance of Roman characters under blurred conditions. Developing high visibility and high legibility of the Roman typeface is requisite for supporting the Thai UD font as well. However, studying the visibility and legibility of Roman letters has still been a necessity, as it represents the international language. Background According to our previous study, Thai Typefaces (Part 1): Assumption on Visibility and Legibility Problems, we examined underlying stages in the visibility and legibility matters of the Thai typefaces where the results have provided the assumption for developing the glyphs of the Thai universal design font (UD font).
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