In other words, the author has created a minor constellation of difficulties for himself by introducing a blind character into the work, so something important must be at stake when blindness pops up in a story. Clearly the author wants to emphasize other levels of sight and blindness beyond the physical. Moreover, such references are usually quite pervasive in a work where insight and blindness are at issue.
So usually the blind character is significant in that they convey a greater meaning?
