May 24: The last book you read

I haven't quite finished this one yet.
It isn't even a new book and the rest of the world may have read this a decade ago, but it is new to me.
It kicks off with a man going blind with no reason at all, it's a different type of blindness, he can see white, not black.
And the blindness is contagious.
How does society deal with a virus that makes people instantly blind? What does the fear of the virus do to behaviour of usually normal people?
I can't tell you how good it ends (or badly) or if the story stays so addictive the whole way through, but I do suggest you get this on your want to read list.