Blindness

From reading so far the car thief was the second person that goes bind and had contact with the first bind man at first I thought that it was karma that caused them to go bind( the thief and girl with the dark glasses) then I realized after the class discussion that the little boy also goes bind and then I probably got a little confused but I am curious as to why the author choose these characters to go bind and it’s probably not karma. I am interested in what’s going to happen next in the facility and how the blindness is going to spread and how would the doctor’s wife acting blind pays out.