Blind people can still use crypto, there are apps out there that can help blind people see although it only works with the good will of the stranger, I forgot the name of the app but it can help blind people by letting an available stranger to be their eyes so there's no problem with bitcoin being used by blind people.
So do the Blind person knows that the available Stanger has goodwill? Most Bitcoiners don't even trust their own close relations with their cryptocurrencies information let alone a Blind person and a stranger? I think this is just another shortfall of Bitcoin and other cryptocurrencies but with time and more adoption, hopefully, there might be a way out for the Blind to get involved in Crypto investments.