The Gospel of John is all about who Jesus is declaring that he is. Theologians have notes this and seen that Jesus does a several things in the Gospel to reveal who he is. The first ones are the seven signs. They are actions (typically miracles) that show who Jesus is the world around him. They literally and figuratively reveal to the world who he is. By John 10, six of the seven have been revealed, the sixth one happening in John 9 is when Jesus heals a man of blindness. As Jesus reveals himself more and more, the signs become more intense. He literally heals a blind man, as he is unblinding the whole world regarding his identity.