Question: I would like to make my LaTeX documents as accessible as possible to those that are blind or visually impaired. 

The posts that I have linked to below ask questions about `alt-tags` or `tooltips`, both of which would be great options. I would like to ask a question along a different tack.

The TUG website <http://www.tug.org/tex4ht/> states that `tex4ht` can convert documents to Braille. I have searched for the commands to do so, but to no avail. 

Does anyone know how to convert a `LaTeX` document (with mathematical content and graphs) to Braille? An OS-independent solution would be ideal.

**Related posts:**

* [Is there an easy way to add hover text to all incidents of math mode where the hover text would contain the LaTeX code?](https://tex.stackexchange.com/questions/32314/is-there-an-easy-way-to-add-hover-text-to-all-incidents-of-math-mode-where-the-h)
* [LaTeX accessibility](https://tex.stackexchange.com/questions/19279/latex-accessibility)

Answer: 
The first thing to do is the convert the text to Braille. I am using LuaLaTeX (it should work with XeTeX as well). So I found Braille [here](http://www.searchfreefonts.com/free/braille.htm) and did a `\setmainfont{Braille}` after installing it as a system font. Leaves formulas and graphs.

Then, I came up with the following idea. Physicists tend to read mathematical formulas as the TeX-commands without the need to typeset. In particular, ASCII emails can still be used, even with extensive formulas. So the most straightforward way would be the `verbatim` environment for the formulas. The `verbatim` package is very handy since `\renewenvironments` combined with `\start{verbatim}` did not work for me without it. `Verbatim` is typeset in monospaced font, we need a `\setmonofont{Braille}` as well.

Leaves us with the graphs. I am not sure if this can be done with a pure LaTeX 'conversion'. If you use e.g. jpgs and `\includegraphics` there is not much LaTeX can do. It might be possible with pdfs to at least replace the axes label and such.

Here is my MWE, I cannot read Braille, I hope the font is good.

```
\documentclass{article}

\usepackage{fontspec}
\setmainfont{Braille}
\setmonofont{Braille}
\usepackage{lipsum}
\usepackage{verbatim}

\renewenvironment{equation}%
   {\endgraf\noindent FORMULA:%
    \endgraf\verbatim}%
   {\endverbatim}

\begin{document}
\lipsum[1]

\begin{equation}
y = m x +b
\end{equation}

\lipsum[2]

\end{document}

```

![Test document](https://i.stack.imgur.com/tDFQ7.png)
[Here](https://myria.math.aegean.gr/labs/dt/braille/index-en.html) or [here](https://ctan.org/pkg/latex2nemeth) one can find information about transforming Latex to Braille. The program is getting better since it was made. It is an effort made from the Mathematics Department of University of the Aegean in Greece, so that blind people can study math. It has already been used to make many documents accessible. It needs some programming skills. One can also find answers to frequently asked questions and a greek dictionary for math symbols in Braille. For more details you should contact the creator. It has successfully been tested for many and big tex documents and it is very fast.