John 9:37

And Jesus said unto him, Thou hast both seen him, and it is he that talketh with thee.

Up to this encounter the man born blind had no knowledge of the identity of the one who had healed him. When he asked who the Son of God is, Jesus answered by declaring that he himself is that person. The declaration means the man had now actually seen him with his restored sight and was at that very moment hearing him speak.

Upon hearing this self-revelation the man worshiped Jesus. In that worship he received him as the one sent by God, his newly restored physical sight joined to an opened understanding that enabled him to recognize Christ. The whole encounter displays Jesus' sympathy and care extending even to those who did not yet know him.