And his disciples asked him, saying, Master, who did sin, this man, or his parents, that he was born blind? (John 9:2)Notice how the Lord Jesus refused to be limited to the disciples’ dilemma when He replied:
Jesus answered, Neither hath this man sinned, nor his parents: but that the works of God should be made manifest in him. (John 9:3)Of course, Christ knew that He was going to heal the blind man. The real purpose of his blindness was that one day the miraculous healing by Christ would manifest “the works of God” in the blind man’s life (which it did).
Wouldn't it be nice if we could assume that would happen all the time? But we all know the reality. Blind people will not be cured by Jesus. Unless science develops a cure, the person will remain blind.