My answer to the question is that :
When Jesus first touched the eyes, the man's vision was not clear, he saw men as tree walking but when Jesus touched him the second time, the healing was perfected, the first touch was to allow a slow entrance of light into his eyes as done by opthamologists when carrying out eye surgery. At the first opening, his eyes were not well adapted to seeing. The wisdom in this pattern of healing is that He wants the eye to fully adapt to seeing.
Mark 8:22-26
[22]And he cometh to Bethsaida; and they bring a blind man unto him, and besought him to touch him.
[23]And he took the blind man by the hand, and led him out of the town; and when he had spit on his eyes, and put his hands upon him, he asked him if he saw ought.
[24]And he looked up, and said, I see men as trees, walking.
[25]After that he put his hands again upon his eyes, and made him look up: and he was restored, and saw every man clearly.
[26]And he sent him away to his house, saying, Neither go into the town, nor tell it to any in the town.
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