Blindness page 16

So far I'm really confused as to what the author is trying to do. The two people that have gone blind so far have been driving the same car. The first person was the owner of the car and he randomly went blind, so did the man who stole his car shortly after. I really don't know what it could be, maybe some pattern or from the beginning the car was stolen. I need to keep reading to sort of figure out what other things are making the characters go blind. Not even the doctor knew how the first man became blind.