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According to the 2012 paper Extra-large letter spacing improves reading in dyslexia, some spacing adjustments could make reading easier for dyslexic people, namely

  • Add 2.5pt to interletter space
  • 3 spaces between words
  • double interline spacing

I am looking for a way to set this document-wide. I have found some packages that provide environments to change each of these spacings independently, but it might be bit tedious to wrap everything in three environments, and I don't know how that would work with figure captions, section titles…

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1 Answer 1

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With inspiration from this and that I have found that

\documentclass{article}
\usepackage{fontspec}
\defaultfontfeatures{LetterSpace=25, WordSpace={3}}
\setmainfont{OpenDyslexic}
\usepackage{setspace}
\doublespacing
\begin{document}
    […]
\end{document}

does what I want. It works with XeLaTeX and LuaLaTeX, not sure about pdfTeX, I don't use that. it should work with all fonts, too, not only OpenDyslexic, but it seemed fitting. The specific numbers should also be adjusted to the font, geometry…

Result of the above code

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