One day the king chanced to remember the sacred garments brought by Nebuchadnezzar out of the Temple at Jerusalem to Babylon. They had vanished, and no trace of them could be discovered. The king suspected Daniel of having had something to do with their disappearance. It booted little that he protested his innocence, he was cast into prison.
God sent an angel who was to blind Darius, telling him at the same time that he was deprived of the light of his eyes because he was keeping the pious Daniel in durance, and sight would be restored to him only if Daniel interceded for him. The king at once released Daniel, and the two together journeyed to Jerusalem to pray on the holy place for the restoration of the king. An angel appeared to Daniel, and announced to him that his prayer had been heard.
The king had but to wash his eyes, and vision would return to them. So it happened. Darius gave thanks to God, and in his gratitude assigned the tithe of his grain to the priests and the Levites. Besides, he testified his appreciation to Daniel by loading him down with gifts, and both returned to Shushtar. The recovery of the king convinced many of his subjects of the omnipotence of God, and they converted to Judaism.