In college I had a side gig for a blind EE student who could not get a particular electronics book in Braille. So I would read chapters onto cassette tapes (yea

In college I had a side gig for a blind EE student who could not get a particular electronics book in Braille. So I would read chapters onto cassette tapes (yeah, '80s!) for him to listen to. There were many equations and such. I also had a stack of semi-soft plastic sheets and a rubber-padded clipboard; drawing on the sheets with the rubber underneath allowed for finger-parsable drawings. Whether to attempt to an audible version of an equation versus making a drawing was the big decision. It was faster if I could read an equation, but I wasn't always sure I was getting it quite right. OTOH, having a large stack of "etchings" was not so good either, and the details had to be marked well enough to feel. I asked the guy once how he could "see" computer screens; he said there was a device that had a matrix of a bazillion pins that was used to create an image of the screen for him to run his fingers over.