I don't know if this is the best place to ask this question, so I apologize for my ignorance about the subject matter.
I'm a writer working on a story, and in doing some research for the visually impaired before and during the Enlightenment I came across
$1 who was this brilliant 18th century English mathematician who lost his sight from smallpox when very young. Somehow, going down the Google Rabbit Hole, I found
$1 by the Yorkshire Post, where they repeat the claim that a local legend says Saunderson "taught himself to read by running his fingers over the gravestones in the churchyard.”
My question is, as a blind person before Braille, what would have been the purpose of knowing the letters if you couldn't use them the same way a sighted person of the time could? Is knowing your letters just the most efficient way to learn a language?
Any help or direction you can provide on the matter would be greatly appreciated.
As well, if it makes it easier, here are the two links mentioned without Reddit formatting.
Link 1, Nicholas Saunderson's Wikipedia page: https://en.wikipedia.org/wiki/Nicholas_Saunderson
Link 2, Yorkshire Post News Article: https://www.yorkshirepost.co.uk/news/why-barnsleys-forgotten-genius-nicholas-saunderson-should-be-immortalised-new-ps50-note-1754428
Thank you