In my experience with dyslexic students, colored overlays (filters) help them reading a lot Colored paper also helps them writing. Different people benefit from different colors, so it's convenient to let them try a few of them you can buy as sets of filters, and choose the best suited form them. In some cases, they might even prefer one for reading and a different one fro writing.

There are also browser extensions, like ColorVeil, that apply a filter effect to all sites, and some others that apply a special font OpenDyslexic, which is also helpful.