What to look for in ebooks
From: Benetech

Are you buying ebooks that all students can read? Not all ebooks are
accessible to students with print disabilities and knowing what to look for
can help your textbook procurement staff make the best decisions for all
students. To be considered accessible, ebooks should meet the following
criteria - see the article.

http://www.benetech.org/our-programs/literacy/born-accessible/accessible-ebooks-what-to-look-for

Related:
Born Accessible
http://www.benetech.org/our-programs/literacy/born-accessible