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Christ does not always touch the afflicted in healing, but in each of the four miracles involving the blind, He touches them, which was appropriate to their condition. They could not see Him, but they could feel His touch.
He used a variety of methods in touching them, as the occasion warranted. In healing these two men and Bartimaeus (Mark 10:46-52), Jesus simply touches the eyes. In Mark 8:22-26, Christ spits on the blind man's eyes then puts His hands on them. As the blindness is not completely healed, He lays His hands on them again. In the healing in John 9:1-41, He spits on the ground to make clay, then puts the clay on the man's eyes and tells him to wash in the pool of Siloam. The blind's sense of touch is heightened, so to feel Christ the healer perform this miracle would never be forgotten.
Martin G. Collins
The Miracles of Jesus Christ: Healing Two Blind Men (Part Two)