It was Jesus who sought the man out, not the other way around seeking to restore what nature had left defective (Chrysostom).
The disciples assume there must be a reason for his suffering (Theodore).
Sin was not the reason for his blindness (Augustine).
Jesus calls Himself light because He enlightens souls but also because He was about to open the blind manís eyes (Theodore) through dust, just as He had done at the beginning of creation (Ephrem).
The light remains in the world as long as Christís presence remains in the world (Augustine).
It is the Lordís Word and command connected with the water that does the healing. Those blind eyes that Jesus had opened with His saliva would testify against the blindness that spit in his face (Ephrem).
In healing the blind man, Jesus completes His work as creator (Irenaeus).