Dyslexia: colour and contrast
The most important factor affecting people who suffer from dyslexia when it comes to colour is contrast: People who suffer from dyslexia find it difficult to read with high contrast levels, So
While contrast can be provided by black text on a white background
this is not so beneficial when considering Dyslexia.
Research suggests that pastel backgrounds, increased line-spacing,
font choice and paragraph justification all have an effect.
Source: NGfL Accessibility Workshop 2004
The choice of Pastel backgrounds as a mean to accomodate users suffering from Dyslexia is also confirmed by a number of other sources amongst which The British Dyslexia association
Below is an example : Dark blue text on pale cream
Optimal colors to improve readability for people with dyslexia
A study contributed to the W3C looked specifically at text and background colour combinations with the aim of improving readability for people who suffer from dyslexia. the study focused on:
performance and preferences, among the different color values across
people with and without dyslexia
source: Optimal colors to improve readability for people with dyslexia
In terms of outcome, the study suggests that dyslexic users read faster and more easily when colour pairs have lower contrast levels.
There is also this piece entitled "Designing for Dyslexics" which could prove useful.The soultion discussed also evolves around creating a lower contrast scheme to cater for users suffering from dyslexia.