Hello, I have done a few courses for an organization that provides an online literacy program for Deaf and hard of hearing adults. Some of the key design points for this audience are as follows:
• Choose fonts that are easy to read - minimum 14pt
• Use clear san-serif or serif fonts designed for the web (i.e.: Cambria, Verdana, Georgia, etc.)
• No script or highly stylized fonts
• Avoid italics, UPPERCASE, and underlined text
• Use bullet symbols for lists
• Develop consistent text style for:
o headings
o body
o buttons
o directions
• Consider readability (colour, contrast, colour-blindness, deaf-blind)
• Leave plenty of white space
• Left justify body text
Accessible Language:
• English is a foreign language to many Deaf learners
• Consider your audience (adult deaf, hard of hearing, deaf-blind literacy learners; approximate literacy levels in English and ASL)
• Write to the audience’s reading level (typically below grade 4)
• Use simplest, clearest language for that level (able to understand the first time they read it)
• Use correct grammar and spelling
• Be mindful of idioms, slang, metaphors, etc.; they do not translate well
This demo is a short example from one of the courses I developed for them.
https://360.articulate.com/review/content/a5cc7580-93fa-49fa-b3d9-f63f0cf5bbb5/review