It is sad to acknowledge these limitations of bitcoin and cryptocurrency as I know it now, to not only be limited based on funds but handicapped situations of individuals.
Bitcoin was not invented by satoshi to solve the financial problems of everyone including handicapped persons. It's aim is to give financial freedom to all that embrace it. The blind man, though unfortunate would not be able to access bitcoin and blockchain related services. Handicapped persons have more problems to find solutions to than trying to join the financial freedom struggle with it. They just deserve to be in a care home, fully taken care of.