Most people would not think about making a comic accessible for people with a vision impairment. Comics are, after all, very visual. The article from axesslab has two short videos showing the before and after treatment of a comic strip. The best that has been achieved in this area so far is basic alt-texts that are picked up by screen reader. They tend to just say things like “background”.
The accessible comic reads well thought out alt-texts which explain what’s happening visually and what’s written in the text. A bit like audio description for documents. The comic is “100 Demon Diaries” and the article was found on the axesslab website, which is a good example of web design – love the large text.