Differently able people and their "Vinyana"
In my opinion, Vinyana is always present, but it is the function and sharpness of the faculty that distinguish the different experiences or what is felt through the faculty. In the context of mediation your faculties should be sharp for your the experience the reality as it is, so a person with diminished faculties generally will not be able to progress in Vipassana.

E.g. if your arm is lost then your limps then you have are not without or diminished Kaya Vinyanaya but due to the fact that a part of the faculty is missing there is not chance that to make contact of even if there is contact I does not register in the case of a blind person.

The ability to move is Power or Ability (Irdi) in which our body reacts to our intentions. The function of Vinyanaya is to register any contact which comes through the sense doors.