I have such feelings too for those who because of their impediment can not freely involve in crypto and bitcoin investment especially the blind. I do believe that with time it may become possible for them to read through roadmap just as the blind study and have certificate in their study area.
With technological advances, it is certain that all will be accommodated, anyone who wants to participate in investing in the crypto field. because technology will follow and include all components that really want to join without restrictions, including as you say, the visually impaired. but it does take time to create all of them, because we know in crypto there are so many scammers hanging around who will clearly break their own good intentions.