Dyslexia

A neurologically-based learning disability that primarily affects the acquisition and processing of written language, manifesting as difficulties with reading, writing, spelling, and phonological processing. Dyslexia varies in severity and is estimated to affect 10-17% of the population in English-speaking countries. It is not related to intelligence or effort. For web accessibility, dyslexia has implications for both interface design (font choice, line spacing, colour contrast, text formatting) and content authoring (readability, plain language, consistent navigation). Research shows that dyslexia-accessible design practices — such as using sans-serif fonts, increased letter spacing, shorter line lengths, and avoiding justified text — also benefit non-dyslexic users and people with other disabilities including low vision.