A general article about online communities. Strangely enough no mention of how online communities might help maintain poor eyesite, or any other disability mentioned in the article. https://gizmodo.com/on-the-early-web-people-with-disabilities-found-commun-1833425205
I assume those who were completely blind used voice software to listen to the messages, and those with some vision found it helpful being able to enlarge the typeface. All very helpful for people with visual problems.
I had a blind student on my business English course about 10 years ago. He worked for a company developing computer software for blind people. I used to send him the documents for the lesson beforehand (as word.doc email attachments) and he'd turn up with a keyboard and earphones just as able to read, write and use a computer as anyone else.