usability - What are the design guidelines to make interfaces friendly to dyslexics?

I've come across this question on Quora where it's likely to be forgotten.

Unlike other disabilities that are often considered in design, dyslexia has many forms. As a result, the guidelines can't be just one-liner, such as "use X font" or "make sure contrast ratio is Y".

The best answer must cite hard evidence.

Answer

There a number of one pagers that talk about how you might design a site for users with dyslexia, I would recommend this three part series Designing for Dyslexics as a solid foundation:

• Part 1 (Definition of dyslexia, population size, implications/effects)


• Part 2 (Lower color contrast & visually impaired users)



• Part 3 (Typography, layouts, language style, information architecture, screen readers)

Here is a style guide from the British Dyslexia Association.