How does the author use foreshadowing in Blindness?

In the blindness of the first man we see a foreshadowing of the infrastructure breakdown that will grip the city after the spread of the white sickness. It is important that the first man struck blind is affected while in his car, an effect which will be repeated millions of times as the disease spreads. In this first moment of blindness, we also see the ambivalence of the people surrounding the blind man.