When Jesus restores Bartimaeus’s sight, no elaborate action is required. (In other healing stories in Mark’s Gospel, actions accompany Jesus’ words).In this instance, Jesus simply says that Bartimaeus’s faith has saved him.
Throughout Mark’s Gospel, the success of Jesus’ healing power has often been correlated with the faith of the person requesting Jesus’ help. For example, it is because of her faith that the woman with the hemorrhage is healed.
When faith is absent, Jesus is unable to heal; we see this after his rejection in Nazareth.