Pseudo-Chrysostom — as excerpted in the Catena Aurea on Matthew 20:29-34

“Or; He asks them on account of their faith, that whereas they who were blind confess Christ to be the Son of God, those who had their sight might be put to shame for their esteeming Him only man. They had indeed called Christ Lord, and they had spoken true; but by calling Him the Son of David, they obliterated this their good confession. For indeed by a misuse of words men are called Lords, but none is truly Lord, but God only. When therefore they say, O Lord, thou Son of David, they thus misapply the term to Christ, as esteeming Him man; had they only called Him Lord, they would have confessed His Godhead. When then He asks them, What would ye? they no longer style Him Son of David, but only Lord; They say unto Him, Lord, that our eyes may be opened. For the Son of David cannot open the eyes of the blind, but the Son of God can. So long then as they cried, O Lord, thou Son of David, their cure was delayed; as soon as they said, Lord, only, healing was shed upon them; for it follows, And Jesus had compassion upon them, and touched their eyes, and straightway they saw. He touched them carnally as man, He healed them as God.”