A couple questions about Scholar, faeries and blindness.

[Norimancy]

Hello!

Sorry to bother you guys with very specific questions, but I'm in the prospect of creating a somewhat lore-coherent character that's still fun to play with, and in the mists of interrogations I have, I had some about the Scholar job, its relation to fairies and if any of them could be blind.
Please pardon me if my terms are wrong, I'm not a native english-speaker and used non-english resources until now (and they're quite limited sadly).
So here we go!

First, about blindness:

• Does blindness exist in Eorzea? Can we see blind people in the game?
• EDIT: As there is a blindfold in-game, is there any point to being blindfolded too?
• If so, what causes are common?
• How is it treated or cured?
• Does braille exist? Do guide dogs (or creatures) exist?

Second, about scholar:

• I've read quite a few things about their codex and books, but most are contradictory. Some pretend the ink is aether-infused and thus readable without having to see it. Some pretend it is merely a book with standard ink, that list military strategies from past times. Some pretend it is a magical artifact or focus to channel aether through. What is the consensus on those?
• It seems they need a soulstone, unlike some classes, to be considered scholars, as it is needed for the fairy/aether construct they invoke. Those soulstones seem to come from Nym and nowhere else ; thus a scholar would need to either find one in Nymian ruins or inherit one from one of his peers. Is that correct?
• To follow-up on this question: it seems we do not have the ability to create a fairy from scratch in Eorzea, as it is ancient lost knowledge or reserved to mages that do not share their ways (Sharlayan mages for example), is that correct?
• Also, while in-game we pack soulstones in our pockets, where are they supposed to be stored?
• Do they usually have one book and never change, or do they cycle through the ones needed for each fight? Do they carry libraries around if so?

And last, about fairies:

• They seem to have sentience, and personalities, but are still bind to their scholar. Could they resist their will and never do as told or is it "programmed" that they obey their soulstone owner no matter what?
• Do they have a morality compass? Can they distinguish from what is right and what is wrong, even if they are forced to do their master's binding?
• As soulstones can be inherited, and only created in Nym in old times, doesn't that mean most fairies are old too? What happens if their stones haven't been found in ages? Do they exist inside them if they're not invoked?

I think that's pretty much it, but I'll probably have more questions from the answers I (hopefully) get. Thank you for your time and patience, I wish you a great day!