Laura Lippay says, “Do you know anyone who is visually impaired? Maybe they have low vision or color blindness, or are fully blind. Think about how they use the Internet. Close your eyes, or at least squint really hard, and try to find today’s news or interact with your friends on Facebook. It’s a challenge many of us don’t think about every day, but some of what we do in SEO can affect the experience that people with visual impairments have when visiting a page.
Accessibility and the Internet

Visually impaired Internet users are able to navigate and use the web using screen readers like VoiceOver or Jaws. Screen readers, much like search engine crawlers, rely on signals in the code to determine the structure and the context of what they’re crawling. The overlap in what search crawlers look for and interpret versus what screen readers look for and interpret is small, but the idea is the same: Where are the elements of this page and how do I understand them?”.

What You Should Know About Accessibility + SEO, Part I: An Intro

MOZ Blog

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