ProQuest Ebook Central
ProQuest Ebook Central (formerly Ebrary) is Lesley's main eBook vendor and has different options for accessibility needs. They target AA conformance level to W3C Web Content Accessibility Guidelines (WCAG 2.0). They are also certified for use with major screen readers like JAWS and VoiceOver. Additionally, book content is formatted to be readable online and offline. Ebook Central also offers OpenDyslexic, an open source typeface designed to assist readers with dyslexia.
You can turn on accessibility mode yourself for Ebook Central. From the Ebook Central home page, go to Settings and then Accessibility Mode. You can also select the OpenDyslexic typeface from the accessibility settings: 
For more information on Ebook Central's accessibility options, you can read the Ebook Central Accessibility Statement, or their Accessibility FAQs. Please note that if you save chapters as PDFs, you may be limited as to the number of how many pages or chapters you can download per day. This is generally a daily limit, not a lifetime limit. This amount will vary depending on the title, and will be on the book's information page on Ebook Central. ProQuest recommends using Adobe Digital Editions for full book downloads.