The hand of the Lord is put for any powerful action of God, whether in mercy or judgment: here it is put for the Divine power wherewith God strikes his enemies. God did in judgment remember mercy, inflicting this blindness only for a season, that it might be rather a medicine than a punishment.
Related Commentaries of Acts 13:11
Acts 13:11
11 And now, behold, the hand of the Lord is upon thee, and thou shalt be blind, not seeing the sun for a season. And immediately there fell on him a mist and a darkness; and he went about seeking some to lead him by the hand.