WPMU Themes - Are they classed as "Accessibility ready" Themes?

Hi, we have just joined WPMU. I am in the process of putting together a site for a blind charity. We want to make sure the site has the best accessibility available for a wordpress site.

Are your Starter Themes that are available to download, classed as accessibility ready? All the blogs on your site don't seem to mention any of your own themes within the themes that are classed as Accessibility ready.