A blind man was brought to Jesus for healing at Bethsaida. At first, Jesus led him out of the town and spat on his eyes. After touching him, Jesus asked him whether he was seeing anything at all. The man said he was seeing men as trees, walking, showing incomplete deliverance. He touched his eyes the second time and asked him to look up and he regained his full sight, that is complete deliverance.
Ordinarily, if somebody has chronic eye problem and visits an eye physician. After the healing process, a gradual exposure to bright light is employed so as not to further endanger the eyesight till full recovery is attained.